Round B Vent, General Information, Planning. M&G Duravent 3GV60, 5GVAF, 4GVRRA4, 3GVFS, 4GV60F, 3GVIS, 3GVRS4, 3GVFF, 4GVRS, 4GVX8

ROUND B VENT

GENERAL INFORMATION

Type B Gas Vents are for venting listed Natural

Gas or Liquid Propane Category I appliances only. The appliances listed below typically

(but not always) use Type B vent systems.

Boilers

Furnaces

Water Heaters

Unit Heaters

Room Heaters

Duct Furnaces

Floor Furnaces

Decorative Gas Appliances

DuraVent Type B Vent Systems may be used on other gas-burning appliances, provided the manufacturer of the appliance states in their installation instructions that Type B-vent is acceptable. Do not use Type B Vents for Category II, III, or IV gas appliances.

Type B Vent shall not be used to vent flue products from incinerators, combination gas/ oil appliances, oil-fired, or wood-burning appliances. If there is a question about the use of Type B Vents, contact the appliance manufacturer or DuraVent’s Engineering

Department for further information.

PLANNING

1. Appliances.

Carefully review the appliance manufacturer’s installation instructions for positioning the unit, any special venting or connector requirements, and verify that it is a Category I appliance or an appliance that requires the use of Type B gas vent.

2. Placement. The placement of the vent and fittings must be in accordance with Local

Codes, as well as accepted venting practices.

If more than one appliance is to be connected

4 to one venting system, the common vent must be correctly sized. It is a good idea to make a sketch of the proposed installation, labelling the components you will need. Adjustable Pipe

Lengths are available to make up odd lengths.

Minimize the number of turns and lateral runs, as the National Fuel Gas Code places limitations on these. A 45° turn is preferable to a 90° turn. The appliance reference material should be consulted at this time, as well as any

Local Authority having jurisdiction. In most localities, building permits are required for any new appliances, or modifications to existing venting systems.

3. Figures 1, 2, & 3 show examples of some typical residential installations.

4. Clearance to Combustibles. A 1-inch clearance (air space) to combustible materials must be maintained, when using

DuraVent Round B-Vent, regardless of the pipe diameter.

5. Combustion Air . Refer to appliance installation instructions and local building codes to ensure compliance with required volume of combustion air for each appliance installed .

6. Slope.

If the venting system contains lateral (horizontal) components, they shall be positioned so they have an upwards slope away from the appliance of not less than

1/4-inch rise per foot of run. (Horizontal vent installed in attics, unconditioned area, or between floors have further restrictions, please consult your local building codes for specific limitations.)

7. Termination Area.

Examine the area where the vent system will terminate. The height of the termination above the roof is determined by the roof pitch, and also it’s proximity to adjacent walls or obstructions. Consult Table

2 for proper termination height requirements.

Vent pipe with 3”-12” diameter must terminate

STOR M

COLLAR

FLASHING

HIGH WIND CAP

DURACAP TOP

DOTTED LINES

SHOW POSSIBLE

OFFSET IN ATTIC

SPACE

SEE TABLE 2

FIRESTOP

SPACER

1 INCH MINIMUM

CLEARANCE

(ALL SIDES)

TOTAL

VENT

HEIGHT

B-VENT TEE

WATER HEATER

CONNECTOR RISE

INCREASER

CEILING SUPPORT /

FIRESTOP

90° ADJUSTABLE

ELBOW

B-VENT

PIPE

FURNACE

CONNECTOR RISE

WATER HEATER

WITH DRAFT HOOD

B-VENT

ENCLOSURE

FAN ASSISTED

FURNACE

1 INCH MINIMUM

CLEARANCE

(ALL SIDES)

LATERAL

Figure 2

CEILING SUPPORT

/ FIRESTOP

VENT C ONNECTS

TO APPLIANCE

Figure 1 at least 2 feet higher than an adjacent wall or obstruction, if it is within 8 feet. Vent pipe with 14” or larger diameter must terminate at least 2 feet higher than an adjacent wall or obstruction, if it is within 10 feet.

8. Connector Rise.

Plan a minimum of one foot vertical connector rise coming out of each appliance.

STEPS FOR TYPICAL

INSTALLATION

1. Location. Building Code requires the appliance(s) to be located as close to the vent as possible. After consulting the local codes, appliance installation instructions and any other applicable reference material determine the optimum location for the appliance(s).

2. Penetration Point. Locate and mark the center of the penetration point through the ceiling or the wall. Refer to Step 3 or 4 , as appropriate.

5

B-VENT WYE

B-VENT USED AS

CONNECTOR

45º / 60º

ADJUSTABLE

ELBOW

FURNACE

CONNECTOR

RISE

DURA-CONNECT

FLEXIBLE SINGLE

WALL CONNECTOR

1 INCH MINIMUM

CLEARANCE

(ALL SIDES)

TOTAL

VENT

HEIGHT

WATER HEATER

CONNECTOR RISE

WATER HEATER

WITH DRAFT HOOD

3 INCH

4 INCH

5 INCH

6 INCH

7 INCH

8 INCH

10 INCH

12 INCH

PIPE SIZE

TABLE 1

STOCK

NUMBER

OF CEILING

SUPPORT

1440

1441

1442

1443

1444

1445

1446

1447

FRAMED INSIDE

DIMENSIONS (X & Y)

FIG.4

6"x6"

7"x7"

8"x8"

9"x9"

10"x10"

11"x11"

13"x13"

15"x15"

FAN

ASSISTED

FURNACE

LATERAL

Figure 3

EXISTING

JOISTS

EXISTING

SHEET

ROCK

FRAMING MEMBERS

REQUIRED FOR

SUPPORT

Figure 4

Figure 5

CLAMP AND

HARDWARE

HANGER

STRAPS

CEILING

SUPPORT

Figure 6

6