American Metal Products 3EIX5 AmeriVent® 3 in. X 5 in. Type B Gas Vent Increaser Installation manual

Installation

& Assembly

Instructions

This symbol on the product means the product is listed by

Underwriters

Laboratories, Inc.

ROUND AMERIVENT

®

TYPE B GAS VENT

Model E - Sizes 3" through 6"

Model R - Sizes 7" through 30"

OVAL AMERIVENT

®

GAS VENT - Model O

Size 4" - Type B, Type B 2x4, Type BW

Size 5" - Type B, Type B 2x4

Size 6" - Type B

AMERIVENT GAS VENT AND ACCESSORIES ARE FOR USE

ONLY WITH LISTED GAS-FIRED APPLIANCES EQUIPPED WITH

A DRAFT HOOD OR OTHER APPLIANCES LISTED FOR USE

WITH TYPE B GAS VENT.

AMERIVENT GAS VENT AND

ACCESSORIES ARE NOT TO BE

USED WITH INCINERATORS OR

WITH APPLIANCES BURNING

SOLID OR LIQUID FUELS.*

Vent sizing and installation are to be made in accordance with all applicable local building codes. For further information, please consult the National Fuel Gas Code

(NFPA 54).

USAGE

AmeriVent Gas Vent and fittings are intended to form a continuous passageway from the gas appliance to the termination of the vent above the roof, including the vent cap.

*For fuels other than gas, write for information on AmeriVent All-Fuel Chimneys or VSI Chimneys.

1

AmeriVent Round and Oval Gas Vent

Installation Instructions

1.

Adequate air supply must be provided for combustion and venting of appliance. Local codes or NFPA 54 specify minimum requirements for combustion ventilation and dilution air.

NOTE:

Failure to provide adequate air may result in extreme hazards to life.

2.

AmeriVent Gas Vent is suitable for installation inside or outside. However, the sizing tables in NFPA 54 are for vents not exposed to the outdoors below the roof line.

Outside vents could reduce venting action; therefore, such installations are not recommended. In the event outside venting is necessary, vents should be sized as close to maximum capacity as possible. Whenever possible, outside vents should be enclosed inside a chase that maintains the minimum one (1) inch clearance to combustibles. Appliances served by an outside vent must have an adequate air supply to balance inside and outside air pressure to reduce the possibility of reverse venting action.

3.

The vent should be sized for the sea level name plate input rating of the appliance in accordance with the procedures set forth in NFPA 54 (The National Fuel

Gas Code), or the American Metal Products Gas Vent

Capacity Tables.

4.

When installing, make sure arrow on the AmeriVent part is pointed up or away from the appliance.

5.

When installed as a Type B Gas Vent, a minimum of one (1) inch airspace clearance to combustible material is required. For Type B 2x4 and BW Vents see Section 2, page 10 for clearance to combustibles.

All locking joints are to be securely snap-locked together. See the rear page of these instructions for detailed information about locking and unlocking vent sections. The first vent section must be screwed to the appliance outlet collar.

6.

AmeriVent Gas Vent Connectors should be installed in accordance with our installation instructions. Unlisted single-wall connector pipe shall be securely supported and joints fastened with sheet metal screws, rivets or other approved means. At the point of connection of the single-wall connector pipe to the double-wall gas vent, three sheet metal screws or rivets may be used as an approved means.

NOTE:

Do not use sheet metal screws at the lock joints of AmeriVent Model E, R, and O Gas Vents.

The use of screws is permissible only where mentioned in the installation instructions.

7.

Wherever possible, install vertical vents directly above appliances before beginning any lateral runs. Lateral venting should be kept to a minimum to avoid vent resistance. Horizontal runs to vents should be either in accordance with the appropriate tables in NFPA 54, or should not exceed 75% of the vertical height of the

2

General Installation Guidelines

vent. Laterals should be supported. Excessive number of fittings, such as elbows and tees, should be avoided.

8.

Maintain a pitch or rise from the appliance to the vent cap on horizontal runs. The pitch shall not be less than ¼ inch to the foot.

9.

Vents must terminate vertically above the roof line.

Refer to the

Termination of Vent Structure

section on page 11 for details.

10.

Strap or support vents securely in position to maintain a minimum of one (1) inch airspace clearance to combustibles.

11.

Firestops must be used where vents pass through floors or ceilings.

12.

More than one gas appliance may be vented into a common vent. Close attention should be paid to vent sizing to assure adequate venting action.

13.

Portions of gas vents that may extend through accessible spaces are to be enclosed to:

a.

Maintain the one (1) inch minimum airspace clearance.

b.

Avoid personal contact with the vent.

c.

Avoid damage to the vent.

IMPORTANT: The enclosure must provide a minimum of one (1) inch airspace to all combustible material and building insulation. Refer to section 2, page 10 for

Type B 2x4 and BW clearances.

14.

In many types of buildings, such as multi-family residential, high-rise and others, vents that pass through floors or ceilings must be located in fire-rated shafts or chases with no openings, except for inspection access. Consult local building code for proper wall construction, access, clearance, support, initial penetration of breeching, and method of termination, or refer to the National Fuel Gas Code

(NFPA 54).

15.

Never vent gas appliances into an unlined masonry chimney. Install either Type B Gas Vent or a listed metal relining system inside chimney to reduce condensation and reduce the chances of improper venting that could occur in unlined chimneys.

NOTE:

While handling sheet metal parts, it is advisable to wear gloves to avoid personal injury from sharp edges or projections.

16.

If a power vent fan is used, make sure it is located at the terminus so as to maintain negative pressure within the vent.

17.

The gas venting system should be inspected prior to the heating season by a qualified technician. This inspection should include removal of the cap to confirm an unrestricted vent.



Installation

Beginning Vent Structure with the

Connector or Breeching System

Single-Wall Connectors

Connect the single-wall to the draft hood of the appliance with three (3) sheet metal screws. Each joint of the singlewall system must be connected with three (3) sheet metal screws. Single-wall connector

must not

penetrate any walls or ceilings, or be used in any cold or nonroutinely inspected areas. Single-wall connector pipe may extend to the first point of penetration of structure where the use of a firestop and support assembly are required. If using

AmeriVent gas vent connectors, refer to those installation instructions.

Type B Gas Vent Connectors

Attach the vent section directly to the draft hood of the appliance with three (3) sheet metal screws. Allow a minimum of one (1) inch airspace clearance to combustibles. Where the vent penetrates structure, use a Firestop and the Support Assembly to maintain proper clearance at this and successive intervals throughout the structure.

Section 1

Models E & R Round

Basic Vent Structure

AmeriVent Type B Gas Vent sizes are specified by the inside pipe diameter. Model E is available in sizes 3" through 6" diameters and has a ¼" airspace between pipe walls. Model R is available in sizes 7" through 30" diameters and has a ½" airspace between pipe walls.

When calculating the assembled length, allow 1" length reduction for the overlap at each joint.

Support of Vent Structure

American Metal Products offers five different types of supports as explained below (see A through E). In addition, field-fabricated supports may be used. Consult local building codes for applicable regulations regarding field-fabricated supports.

A. Directions for Installing AmeriVent Buckets

NOTE:

AmeriVent Bucket Hangers (ABH) are available for sizes 3-inch through 8-inch only. Hangers are designed to fit between 16-inch on-center joists.

AmeriVent Buckets in size 9-inch and larger do not use hangers. Instead, they must be nailed in place into a properly sized, framed-in opening.

AmeriVent Buckets in sizes 3-inch through

8-inch may also be nailed in place into a properly sized, framed-in opening as an alternative to using bucket hangers.

Installations Using AmeriVent Buckets (AB) with

Hangers (ABH) - Sizes 3-inch through 8-inch only

1.

Check to see that center-to-center distance between joists is 16 inches nominal. If not, additional framing must be added.

2.

Bend the four rectangular tabs inward on AmeriVent

Bucket. This will center vent pipe and maintain a

1-inch minimum clearance to outside wall of

AmeriVent Bucket. See

Figure 1

.

BEND TABS

INWARD

NAIL 4

PLACES

PER SIDE

Figure 1

HANGER

BRACKET

Figure 2

3.

Place U-shaped hanger bars through pairs of openings in the side of the AmeriVent Bucket. Note that open portion or U-shaped bar faces downward. Do not use rectangular openings with inward-bent tabs. Instead, pass hanger bars through closest pairs of plain openings as shown in

Figure 2

.

4.

Nail both hanger brackets into sides of joists.

Bottom edge of brackets should be even with bottom edge of joists. Use four nails per bracket, nailing through small triangular-shaped openings in brackets.

DO NOT RELY ON TRIANGULAR-

SHAPED BARBS TO HOLD BRACKETS IN

PLACE. BRACKETS MUST BE NAILED TO

JOISTS.

See

Figure 3.

5.

Snap hanger bars into slots in hanger bracket.

6.

The AmeriVent Bucket Support does not serve as a firestop. A firestop is required when using the bucket as a support.

JOIST

16 INCHES NOMINAL

Figure 3

3



Installation Using AmeriVent Bucket Without

Hangers

1.

Completely frame in (on all four sides) a properly sized square opening. Select opening size so that outside wall of AmeriVent Bucket (AB), 3-inch through 8-inch, will contact framing at four sides.

See

Figure 4.

Figure 4

2.

Position AmeriVent Bucket through opening so that bottom of Bucket will be flush with, or a little below, bottom of ceiling.

3.

Nail through sides of AmeriVent Bucket into framedin opening. Nail on all four sides, using a minimum of two nails per side (8 nails total, minimum).

Bucket Connectors

The Bucket Connector (EBC), sizes 3-inch through 6inch, is used to make the connection of either AmeriVent single-wall connector pipe, or AmeriVent Type B Gas

Vent, utilized as connector, through the bottom of the

AmeriVent Bucket.

TYPE B GAS VENT

BUCKET SUPPORT

CEILING

BUCKET CONNECTOR

#8 X 1/2 SHEET METAL

SCREW THROUGH EACH LEG

AMERIVENT TYPE B GAS VENT OR

AMERIVENT VENT CONNECTOR

Figure 5

4

1.

The Bucket Connector is installed by positioning it against the bottom of the AmeriVent Bucket, as shown in

Figure 5

, with the mounting tabs against the bottom of the bucket.

2.

Position the inner wall of the Bucket Connector inside the bottom end of the inner wall of the B

Vent section through the hole in the bottom of the bucket. Attach the mounting tabs with sheet metal screws.

3.

Provide additional strapping or hangers for connector offsets.

B. Firestop Supports

The Firestop (FS) and Support Bracket (SB) are designed for use with Type B Gas Vent in sizes

3-inch diameter through 8-inch diameter.

When used by itself, the Firestop (FS) serves as a firestop, while maintaining one-inch clearance to combustibles from the outer wall of the Type B Gas

Vent. When the Firestop (FS) is used with the

Support Bracket (SB), this combination of parts

(FSP) serves as both a firestop as well as a support.

Each support is designed to support up to 20 feet of vent pipe when installed as follows:

1.

It is recommended that the Vent Pipe be supported at least every other floor. The distance between supports must not, in any case, exceed 20 feet.

2.

Frame in an opening providing one-inch clearance to

AmeriVent Type

B Gas Vent.

See

Figure 6

and

Table 1

.

SB

SUPPORT

BRACKETS

FS

FIRESTOP

Vent Size “A” Square

3E 5½ inches

4E 6½ inches

5E

6E

7R

8R

7½ inches

8½ inches

10 inches

11 inches

Table 1

Figure 6



3.

Secure Firestop Support (FSP) as shown in

Figure 7

.

Install strapping (minimum ¾", 28-gauge) through all four slots in collar, and nail as shown or nail at all four slots as shown in

Figure 8

and

Figure 9

.

NAIL STRAPPING

IN PLACE

(FOUR PLACES)

Figure 7

4.

Pass AmeriVent Type B Gas Vent through opening in

Firestop Support (FSP).

5.

If used as a support, install Support Bracket (SB) as shown in

Figure 6

. Clamp bracket securely to pipe section, using the pair of bolts and nuts provided.

For installations with multiple supports, an adjustable length section of Type B Gas Vent should be installed between each pair of locations where a

Firestop with Support Bracket is used. See

Figure

10

. This provides relief for linear thermal expansion.

The adjustable length section should be positioned directly under the Vent Pipe section that is being supported.

NOTE:

When installed with the entire vent in a vertical position as shown in

Figure 10

, the bottom end of the adjustable length sections should not be secured with the screws provided. This will allow movement to compensate for expansion.

See section titled

Adjustable Length Sections

on

Page 7

.

NAIL THROUGH

SLOTS

(FOUR PLACES)

FIRESTOP SUPPORT

WITH SUPPORT BRACKET

ADJUSTABLE LENGTH

SECTION

20 FEET

MAXIMUM

FIRESTOP SUPPORT


ADJUSTABLE LENGTH

SECTION

Figure 8

20 FEET

MAXIMUM

NAIL THROUGH

FIRESTOP BASE

(FOUR PLACES)

FIRESTOP SUPPORT


ADJUSTABLE LENGTH

SECTION

APPLIANCE

DRAFT HOOD

Figure 10

Figure 9

5



C. Installation Instructions for Optional

Model EGS Firestop Gripper Support

1.

At the desired location, cut a square or circular hole in the floor at a minimum of 2½ inches larger than the nominal pipe size, but not greater than 4 inches larger. See

Table 2

below. This will provide the

REQUIRED 1-INCH CLEARANCE FROM

COMBUSTIBLES.

Support Hole Dimensions

Nominal Pipe Size

(inches)

3 4 5 6

Minimum Hole Size

(inches)

5.5

6.5

7.5

8.5

Maximum Hole Size

(inches)

7 8 9 10

Table 2

2.

Place the support over the hole with the ring down.

The Gripper Support (EGS) should be attached to the TOP of the opening only.

3.

Use an 8 penny nail or self-drilling sheet metal screw in each corner at least 3/8" from the edge.

4.

Pipe should be inserted from below. A maximum of

30 feet of pipe may be installed above the support before resupport is required. See

Figure 11

.

D. Round Support Plates

The Round Support Plate (RSP) Support is designed for use with 9-inch diameter and larger Type B Gas Vent.

Each support is designed to support up to 30 feet of Vent

Pipe when installed as follows.

1.

It is recommended that the Vent Pipe be supported at least every other floor. The distance between supports must not, in any case, exceed 30 feet.

2.

The circular cutout in the Round Support Plate is designed to engage the uppermost recess in the female end of the Vent Pipe. See

Figure 12

.

UPPERMOST

RECESS

Figure 12

3.

Surround the Vent Pipe with the two identical

Support Plate halves. See

Figure 13

. Engage the plate edges in the uppermost pipe recess as described in

Step 2

. Use two pair of bolts and nuts to hold the plate halves together. (Four predrilled tabs are provided for this purpose.)

Figure 11

Figure 13

4.

Mounting holes are provided around the perimeter of the Round Support Plate. Use appropriate fasteners to secure the Support Plate halves to the opening between floors. (Round Support Plates should be attached to the TOP of the opening only. See

Figure 14

.)

5.

For installations with multiple supports, an Adjustable

Length Section of Type B Gas Vent should be installed between each pair of locations where a support is used. See

Figure 14

. This allows the

6



location of the pipe recess to be in the proper position at each opening where a support is to be used. The Adjustable Length Section also provides relief for linear thermal expansion. The Adjustable

Length Section should be positioned directly under the Vent Pipe Section that is being supported.

ROUND

SUPPORT

PLATE

ADJUSTABLE

LENGTH

SECTION

ROUND

SUPPORT

PLATE

ADJUSTABLE

LENGTH

SECTION

ROUND

SUPPORT

PLATE

ADJUSTABLE

LENGTH

SECTION

APPLIANCE

DRAFT HOOD

30 FEET

MAXIMUM

30 FEET

MAXIMUM

Figure 14

E. Vent Pipe Hanger and Support Bracket

Assembly

The Vent Pipe Hanger (VPH) (sizes 3-inch through

7-inch) and the Support Bracket Assembly (SBA) for

8-inch through 12-inch Type B Gas Vent are used to provide lateral and some vertical support for sections of

Vent, as well as the correct clearance to combustible materials. They also provide support and resupport for offsets and horizontal runs.

Adjustable Length Sections

Adjustable Length Sections (12A and 18A) of Type B Gas Vent are available to allow for installation where fixed-length sections do not produce the desired dimensions. Sizes 3-inch through

8-inch use a single sheet metal screw, which should be screwed into the mating section of Type B Gas Vent. Sizes

9-inch and above use two sheet metal screws equally spaced around the mating section. Oval lengths use a clamping method consisting of a screw and tabs to draw the outer wall tightly around the mating section of Type B Gas Vent.

Adjustable Length Sections may also be used to compensate for linear thermal expansion between two fixed points in the vent system. Examples of this are shown in

Figures 9 and 14

. In these examples the fastening devices are not used. This allows for expansion between two fixed supports or between a fixed support and the appliance. Note that the fastening means should be left loose only if the Vent and the

Adjustable Length Sections are installed vertically. If the

Adjustable Length Sections are used in a position other than vertical, such as between offsets, the fastening means should be used.

Finally, when joining an Adjustable Length Section to another section of Type B Gas Vent, make sure that there is a minimum overlap of two inches.

Firestopping

All Type B Gas Vent passing through floors, ceilings or within vertical stud walls must be firestopped at floors or ceilings. The Firestop must effectively close the opening between the outer wall of the Vent Pipe and the hole cut in the structure. In attics, the Firestop should be placed on top of the framed ceiling opening to prevent insulation and debris from coming into contact with the Vent Pipe.

NOTE:

The Firestop Support Plate Assembly (FS), the

Support Plate, or Vent Collar functions as a

Firestop at the location where it is installed.

Wall Thimble

The Wall Thimble (WT) is available to use where a

Type B Gas Vent passes through a vertical wall. The

Wall Thimble will provide for the proper clearance to combustible material as the vent passes through the wall, and will also act as a firestop for the vent.

7



Universal Adapters

The Universal Adapter (EUA-M and EUA-F) is available in sizes 3-inch through 6-inch in both male and female versions. The Universal Adapter may be used to connect AmeriVent round Type B Gas Vent to other manufacturers listed Type B Gas Vent as shown in

Table 3

.

1. General Products - Air Jet

2. Hart & Cooley Vent

3. Selkirk Metalbestos - Household Mfg., Eljer

4. Metal Fab

5. Mitchell Metal Products - Mitch Vent

6. Simpson Dura Vent

7. White Metal Products - Twin Stacks

8. GSW - Jakes - Evans

Table 3

TIGHTEN

FASTENER

SECURELY

AMERIVENT

TYPE B GAS VENT

AMERIVENT

UNIVERSAL ADAPTER

MALE

EUA-M

ANY OF THE LISTED TYPE B

GAS VENTS SHOWN ABOVE

IN TABLE 3.

1.

The Universal Adapter is installed, as shown in

Figure 15,

by sliding the Adapter over the outside wall of the other listed Type B Gas Vent. For the Male

Adapter, the inner wall goes inside the other Gas Vent, while the inner wall for the Female Adapter goes around the outside of the bottom end of the inner wall of the other Gas Vent.

2.

When the Universal Adapter is in place, tighten the fastener securely.

3.

The Universal Adapter is not intended to act as a structural member, and the Vent installation should be resupported.

Increasers

An Increaser (IX) is used to make a transition from a smaller vent diameter to a larger vent diameter. The Increaser is available in steps up to a maximum of four (4) sizes larger.

For example, a 4-inch diameter vent can be increased with a single Increaser from 4-inch to 8-inch or 5-inch to 9-inch.

Tees and Wyes

Model E and R Tees (T) and Wyes (Y) are designed for breeching or as connectors for vertical, sloped, or horizontal systems. They can also be used to provide access for inspection or drain fittings. Tees and Wyes must be isolated from expansion forces by supporting as needed and with

Adjustable Length Sections. Any unused open end of the

Tee or Wye should be closed off with a Tee Cap (TC).

Reducing Tees (T) and Wyes (Y) are also available.

C

A

B

D

AMERIVENT

UNIVERSAL ADAPTER

FEMALE

EUA-F

AMERIVENT

TYPE B GAS VENT

Figure 15

Elbows and Offsets

AmeriVent Type B Gas Vent Model E, sizes 3-inch through

6-inch, and Model R in sizes 7 and 8-inch, are available in both a 45º and 90º fully adjustable offset. The 9-inch through 14-inch Model R is only available in a 45º adjustable elbow. The 16-inch and larger is available in 45º nonadjustable elbow. See

Tables 4 and 5

for relative dimensions of offsets and combinations of offsets.

Whenever Model E or R Gas Vent Pipe is changed from a vertical direction, the Vent system must be resupported before and after the change in direction. The support should provide rigid stability, both vertical and horizontally.

See

Figure 16

. Check with your local Building Officials to make sure any alternative support method is acceptable.

Code

No.

Size A B C

3EAL 3" 5" 5¼" 1½" 8"

D

4EAL 4" 5" 5½" 1¾" 8¾"

5EAL 5" 5½" 6" 2¼" 9¼"

6EAL 6" 6½" 7" 2½" 10¼"

7RAL 7" 7¾" 8" 3" 12¼"

8RAL 8" 8¾" 9" 3¼" 13"

Table 4

8



BRACED IF IT EXTENDS MORE THAN 5 FEET ABOVE ROOF.

SEAL AROUND

COLLAR &

FLASHINGS

SEE

TERMINATION

TABLE

MAINTAIN

1-INCH CLEARANCE

SUPPORT

LATERALS

TERMINATE

VENT

AT LEAST

5 FEET ABOVE

DRAFT HOOD

FIRESTOP

SUPPORT

ASSEMBLY

VERTICAL

VENT

DRAFT HOOD

CONNECTOR

ADEQUATE

AIR SUPPLY

LISTED

APPLIANCE

Vent

Size

5

6

3

4

A

3

3

7

/

8

3 1

/

4

4

10

12

8

9

14

16

18

20

22

24

26

28

30

Table 5

4 3

/

4

5

5 7

/

8

6

6

5

/

8

7

7

9

/

16

8 1

/

2

8

8

5

/

8

9

9

1

/

2

10

Figure 16

B

5 3

/

8

5

3

/

8

6

1

/

2

7

7

1

/

2

8 5

/

8

7 5

/

8

8

5

/

16

9

9

1

/

2

10

2 3

/

4

3

1

/

16

3 1

/

4

3

13

/

16

4

1

/

4

4 9

/

16

5

MAXIMUM OFFSET IN INCHES

With Two

45°

With Two 45° Elbows and:

Elbows One One One One One One One

ONLY 6" Length 12" Length 18" Length 24" Length 3' Length 4' Length 5' Length

7 1

/

4

7

1

/

4

8

1

/

2

9 1

/

4

10

10 1

/

4

10 1

/

4

11

1

/

4

12

12

3

/

4

13

1

/

2

3 1

/

4

3

1

/

4

4 1

/

4

4

1

/

2

5

5 1

/

2

6

6 3

/

4

7

7 3

/

4

8

8

1

/

2

9

—

—

—

—

—

—

—

—

—

—

—

—

11

11

12

1

/

4

12

1

/

4

12

3

/

4

18

19

19 3

/

4

20

1

/

2

21

1

/

4

15 1

/

4

15

1

/

2

16 1

/

4

16

17

24

1

3

25

1

/

/

/

2

13 1

/

4

17 1

/

2

13

15

15

3

/

4

18

19 1

/

4

19

1

/

4

16

1

/

4

17

17

18

3

/

4

20

1

/

2

21 1

/

4

22

22 1

/

4

22 1

/

4

23

1

/

4

24

4

2

19 1

/

2

19

3

/

4

20 1

/

2

20

3

/

4

21

1

/

4

21 3

/

4

22

1

/

4

23 1

/

2

23

1

/

2

24

3

/

4

25 1

/

2

26

1

/

4

26 1

/

2

26 1

/

2

27

1

/

2

28 1

/

4

29

29

3

/

4

28

28

1

/

4

29

29

1

/

4

29

3

/

4

30 1

/

4

30

3

/

4

32

32

33

1

/

34

34

3

/

35

35

36

4

4

36 3

/

4

37

1

/

2

38

1

/

4

36 1

/

2

36

3

/

4

37 1

/

2

37

3

/

4

38

1

/

4

—

—

—

45

45

46

1

/

4

46

1

/

4

46

3

/

4

47 1

/

2

—

OFFSET

—

— —

—

—

—

45°

—

—

—

—

A

B —

—

—

—

—

—

—

Note:

—

VERTICAL

RISE one “B” dimension to

Maximum Offset.

B

9



Section 2

Model O Oval

Basic Vent Structure

AmeriVent (Model O) Oval Gas Vent is available in sizes 4,

5, and 6-inch. The individual sizes reflect the flow rate capacities equivalent to 4-inch, 5-inch, and 6-inch Round

Type B Gas Vent. The joint of the Model O Type B Oval

Gas Vent takes up one inch when assembled. The Model

O Gas Vent is UL-listed for the following applications and clearances to combustibles as shown in

Table 6

.

Underwriters Laboratories-listed

Minimum Clearances to Combustibles

Oval AmeriVent

Description

4", 5" and 6"

4" and 5"

(when installed in 2x4 stud wall with otherthan-recessed heater)

4"

(when installed in 2x4 stud wall with recessed heater)

Type Minimum Clearance

B

B2x4

B-W

1"

Clearances as determined by use of 4OFS or 5OFS firestop spacers at each ceiling level

Clearances as determined by use of 4OHD hold-down plate, 4OPS ceiling plate spacers, and 4OFS firestop spacers

Table 6

Type B Oval Gas Vent

Type B Oval Gas Vent is available in sizes 4, 5, and 6-inch, and requires a 1-inch clearance to combustibles. This includes all Vent Sections, Elbows, Tees, and Adapters.

When used as Type B Gas Vent, Model O must follow all of the same requirements as round Type B Gas Vent, such as the necessity of using firestops at each floor level. See

Section 1

.

Installation of Type B 2 x 4 Gas Vent

1.

Cut out the ceiling plate in the space where the Vent is to be installed.

2.

Nail a 2x4 support (A) at the desired height between the studs. See

Figure 17

.

3.

Attach the Tee Support (B), the Tee (C) with the

Oval Tee Cap, and the Vent Pipe (D) as shown on

Figure 17

.

4.

At each floor level above the Tee, install the Firestop

Spacer (E) as shown in

Figure 17

.

NOTE:

Provide at least a 1-inch clearance around the Tee branch where it passes through combustible wall construction.

E

D

C

Type B 2 x 4 Gas Vent - 4" or 5" Oval

Four- and five-inch AmeriVent (Model O) Gas Vent may be installed within a standard 2x4 stud wall if

all

the following conditions are met.

1.

Arrows on AmeriVent parts should always point up.

2.

Stud bay must be a 16-inch, on-center stud bay.

3.

2x4 studs must be a minimum of 3.5 inches deep.

4.

There must be nothing else in the stud bay other than the Vent Section.

This includes any type of insulation.

5.

The Firestop Spacer (FS) must be installed at each floor level. See

Figure 17

.

NOTE:

Only the straight Vent Pipe Sections, with or without the Oval Tee, may be used inside the stud

10

bay with reduced clearances to combustibles.

See

Figure 17

.

B

A

Figure 17

Type B-W Gas Vent - 4" Oval

AmeriVent (Model O) Gas Vent may be installed within a standard 2x4 stud wall if

all

the following conditions are met.

1.

Arrows on AmeriVent parts should always point up.

2.

Stud bay must be a 16-inch, on-center stud bay.

3.

2x4 studs must be a minimum of 3.5 inches deep.



4.

There must be nothing else in the stud bay other than the Vent and furnace.

This includes any type of insulation.

5.

The installation must contain an Oval Hold-Down Plate

(4OHD) at the base, Oval Plate Spacers (4OPS) at the first ceiling level, and Firestop Spacers (4OPS) at any additional floor levels. See

Figures 18

and

19

.

Installation of Type B-W Gas Vent

1.

Cut out the ceiling plate at the floor level above the heater flush with studs in space where Vent is to be installed.

2.

Nail one AmeriVent Plate Spacer (40PS), (A), across cut-out area in ceiling plate. See

Figure 18

. Plate

Spacer (4OPS) is required at the first ceiling level above a wall furnace to center and space vent properly and to provide the required opening between floors.

3.

Snap Hold-Down Plate (4OHD), (B), onto bottom end of

AmeriVent pipe as shown in

Figure 18

. Install Vent

Section in position. Use two No. 8 binder head sheet metal screws to attach Hold-Down Plate firmly to

Furnace header plate through pre-punched holes.

4.

Nail second AmeriVent Plate Spacer across cutout ceiling plate as shown in

Figure 18

. Firestop Spacers

(OFS) must be used at subsequent levels.

5.

If the Vent is to continue additional stories within a 2x4 stud space, install Firestop Spacers at the second and subsequent ceiling levels as shown in

Figure 19

.

After passing through the last Firestop Spacer, the Vent may be finished with either round or oval AmeriVent fittings, flashings and AmeriVent Cap. (Round pipe, fittings, flashings, and vent caps cost less than corresponding oval parts.)

Attic Insulation Shield

In some areas, the building code requires the use of an attic insulation shield (AVS) on single-story Type B-W installations.

Termination of Vent Structure

Multi-Story Type B-W Installations

AT SECOND AND

SUBSEQUENT CEILING

LEVELS, USE 40FS

FIRESTOP SPACERS.

AT FIRST CEILING LEVEL,

USE 40PS CEILING

PLATE SPACERS.

6.

Type B-W

Installation

A

Figure 19

The AmeriVent Gas Vent is available for most models and sizes in two styles of Termination Tops--AmeriVent

Cap and Universal Cap. The AmeriVent Cap is a lockneck design with the same lock as the female end of the

Vent sections. The Universal Cap is designed to fit inside the inner wall of the vent sections.

American Metal Products 12" and smaller Gas Venting

Systems, using either the AmeriVent Cap or the

Universal Cap, may terminate in accordance with

Table

7

and

Figures 20

and

21.

B

Figure 18

11



AmerVent Cap 12" and Smaller

Gas Vent Termination Table

Roof Pitch

Flat to 7/12 over 7/12 to 8/12 over 8/12 to 9/12 over 9/12 to 10/12 over 10/12 to 11/12 over 11/12 to 12/12 over 12/12 to 14/12 over 16/12 to 18/12 over 18/12 to 20/12 over 20/12 to 21/12

Minimum Height

1.00 feet

1.50 feet

2.00 feet

2.50 feet

3.25 feet

4.00 feet

5.00 feet

6.00 feet

7.00 feet

8.00 feet

Table 7

CAUTION

WHERE HEAVY SNOWFALL OCCURS, THE CAP

SHOULD BE INSTALLED TO MEET THE ABOVE

MINIMUM HEIGHT REQUIREMENTS ABOVE THE

AVERAGE SNOW DEPTH.

AmeriVent Caps 3" thru 30"

10' OR LESS

2'

MIN.

2' MIN.

WALL OR

PARAPET

AmeriVent Caps 12" and Smaller

8' MIN.

The vent termination should not be less than 8 ft.

from a vertical wall.

SEE GAS VENT

TERMINATION TABLE

Figure 20

AmeriVent Caps larger than 12" must be located at least 2 feet above the highest point where they pass through a roof and at least 2 feet higher than any portion of a building within a horizontal distance of 10 feet.

10' MIN.

2' MIN.

2' MIN.

NOTE:

NO HEIGHT ABOVE

PARAPET REQUIRED

WHEN DISTANCE

FROM WALLS OR

PARAPET IS MORE

THAN 10’.

Figure 22

A cap or chimney housing offers resistance to the entrance of rain, snow and debris, as well as birds, and will minimize the effect of wind on the vent. It will protect the vent from down drafts due to a wind that impinges directly upon the vent.

However, no vent cap, cowl, or top can overcome the adverse effect of a region of high static pressure around the vent terminal or the effect of an interior region of low pressure. Regions of high static pressure around the vent terminal can be avoided by following the general rule for the vent termination given previously. Low or negative interior pressures in the building may be caused by (1) failure to provide for combustion air, (2) excessive use of exhaust fans, and (3) tight construction resulting in the lack of infiltration air.

1.

To ensure a waterproof roof structure, use the appropriately sized flashing and storm collar where the vent penetrates the roof. Place the Storm Collar over the vent until it is level. Apply a thick horizontal ring of nonhardening, high-temperature mastic, such as silicone, around the vent at the top of the Storm Collar.

2.

Vents in excess of 5 feet above the roof should be securely guyed to prevent unnecessary movement.

Attach guying to the vent. Never attach guying to the cap.

3

.

To prolong life and appearance of galvanized steel parts located outside, use proper painting procedure.

a.

Remove oil and dirt with a solvent.

b.

Paint with primer specifically recommended for adhesion to galvanized steel.

c.

Apply finish coat.

Figure 21

12

Checking Vent Operation

After adjusting appliance and lighting main burner, allow several minutes for warm-up to begin venting action.

For water heaters and equipment with draft hoods, hold a lighted match along the rim of the draft hood relief opening of the appliance. Proper venting will draw the flame up or into the draft hood. Improper venting, indicated by escaping or spilling of burned gas, will cause the match to flicker or go out. When consulting Standard NFPA 54, follow procedures for conducting safety inspections of existing appliances and placing equipment in operation, paying particular attention to the section titled

Checking the Draft.



IMPORTANT!

1. Connect this GAS VENT

only

to gas-burning appliances, as indicated in the Installation Instructions.

Do not

connect to incinerators, or to liquid or solid fuel-burning appliances.

2. This VENT SYSTEM must be inspected by a

qualified professional

prior to

each

heating season. This inspection should include the removal of the Vent Termination Cap to confirm that there are no obstructions in the vent.

13



Notes

14



IMPORTANT NOTICE

TO INSTALLER !!

POST THIS NOTICE NEAR THE POINT

WHERE THE CONNECTION IS MADE TO THE

GAS VENT !

IMPORTANT!


only

to gas burning appliances, as indicated in the Installation Instructions.

Do not




prior to

each

heating season. This inspection should include the removal of the Vent

Termination Cap to confirm that there are no obstructions in the vent.

IMPORTANT!


only

to gas burning appliances, as indicated in the Installation Instructions.

Do not




prior to

each

heating season. This inspection should include the removal of the Vent

Termination Cap to confirm that there are no obstructions in the vent.

15



Locking and Unlocking Instructions

Model E and R

TO LOCK JOINT

1. Line up pipe ends.

(Embossed arrows must point up or away from the appliance.)

2. Press together until couplers Snap-Lock.

TO UNLOCK JOINT

3. Pipes are now firmly connected.

1. On sizes up to 7", pry out the 3 teeth marked with dots. For larger sizes, pry out all teeth.

Model O

TO LOCK JOINT

2. Rotate joint slightly while pulling gently apart.

TO UNLOCK JOINT

1. Place female coupler over preceding male coupler.

2. Press other side of pipe down until joint seats.

3. Press other side of pipe down until joint

SNAP-LOCKS.

1. Insert screwdriver one inch into joint as shown.

2. Press firmly inward with blade of screwdriver and pry upwards VERY

SLOWLY AND GENTLY.

Joint will slowly separate without damage.

800-669-3190

technical services

16

©2006 American Metal Products Group All rights reserved Form No. 803981 06/20/2006 Printed in U.S.A.

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