Economical venting of Category II, III and IV
condensing and non-condensing heating
appliances requiring a direct vent | concentric
venting system.
FasNSeal
®
Concentric Vent System (CVS)
Listed to UL-1738
®
FasNSeal® Concentric Venting System
Specifications
FasNSeal Concentric Venting System
Applications
FasNSeal Concentric Venting System
(CVS) (direct vent or two-pipe system)
for use with condensing natural gas
or propane Categories II, III and IV
appliances or Canada’s Type BH Gas
Vent Systems, having a maximum rated
operating temperature of 500°F. CVS can
be used on a wide range of appliances,
including: gas boilers, warm air furnaces,
water heaters, unit heaters, or tankless
water heaters.
An economical venting solution for condensing and noncondensing appliances, the Concentric Venting System (CVS)
features a UL1738 approved super-ferritic stainless steel inner
wall. The proprietary twist-lock connection eliminates use of
clamps or mechanical fasteners and saves installation time. Only
one penetration is needed through the roof or the wall for both
exhaust and combustion air. Multiple pipe lengths and telescoping
pipe extensions eliminate field cutting of pipe. CVS is the only
concentric vent system to incorporate o-rings on the inner wall and
outer casing to prevent exhaust or combustion air leakage. Custom
adapters are available to transition from co-linear to coaxial
venting systems.
Materials and Construction
Unitized concentric construction.
Inner: Laser-welded UL approved 444
super-ferritic stainless steel .012”
Outer: Laser-welded, paintable,
zincalume .018”
Silicone O-ring seals on inner liner
and outer wall. Precision twist-lock
connection on outer wall.
Clearnaces
FasNSeal CVS is listed to 0” clearance as a
double-wall vent system for Category II,
III, and IV appliances, for flue temperature
of up to 400-degrees F for horizontal
enclosures, and up to 480-degrees F for
vertical enclosures. When FasNSeal
CVS is used as a concentric/
direct vent system, the clearance
to combustibles is specified by the
appliance manufacturer.
Listings
FasNSeal CVS vent pipe is listed to
UL 1738 (MH25700) as a double-wall
vent system for Category II, III and IV
appliances. It is pressure rated to 10
WC for the inner pipe. This product is
also intended to be used as a direct
vent system for Category II, III and
IV appliances or other gas burning
appliances that are listed to be used with
direct vent pipe.
Diameter
3” inner and 5” outer.
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The built-in condensate management system prevents standing
condensation. The Concentric Venting System is a fully sealed, gas
tight system to deliver superior performance with the heating unit.
Concentric Vent System | FasNSeal
Concentric System
Advantages of Concentric
Typical Installations
A concentric (or direct-vent, or two-pipe)
system maintains indoor air quality by
reducing drafts with one penetration,
and allows for better humidity level
control inside a dwelling. Concentric
venting brings to the heating appliance
outdoor air as combustion air through
an air-tight, sealed system that is safe.
Horizontal
Termination
Outer Trim Ring
Inner Trim Ring
Wall Strap
Vent Length
Elbow
Vent Length
Vertical Termination
Storm Collar
Flashing
Firestop Support
Vent Length
Firestop Support
Elbow
Wall Strap
Elbow
Vent Length
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FasNSeal | Concentric Vent System
Concentric Vent System
Vent Length
Use to vent boilers, water heaters, warm air furnaces and other
categoryry II, III or IV condensing or non-condensing appliances
requiring a concentric vent.
A
SIZE
STOCK #
A
3” x 5”
35CVS-06
35CVS-12
35CVS-24
35CVS-36
6”
12”
24”
36”
3” x 5”
3” x 5”
3” x 5”
Telescoping Adjustable Length
Use to add length to straight lengths of CVS pipe. Amount of
adjustable length listed in chart. Requires at least ½” overlap for a
secure connection.
SIZE
STOCK #
A
3” x 5”
35CVS-12TA
35CVS-18TA
8 ½” - 12”
12” - 18”
3” x 5”
A
90° Elbow
Use to go from horizontal to vertical runs or vertical to horizontal
runs. Use to turn vent 90°. Sloped at 880 to direct condensate
back to the appliance.
A
SIZE
STOCK #
A
B
3” x 5”
35CVS-E90
5¾”
5½”
B
45° Elbow
B
A
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Offsets obstructions as needed. Allows for better condensate
management and less back pressure. Sloped at 440 to direct
condensate back to the appliance.
SIZE
STOCK #
A
B
3” x 5”
35CVS-E45
4”
4¼”
Concentric Vent System | FasNSeal
Wall Thimble
Use for through-the-wall installations. Fits between standard
wall studs.
B
ØA
Trim Ring, Outer
ØA
SIZE
STOCK #
A
B
C
3” x 5”
35CVS-WT
51⁄8”
17”
10”
C
Conceals gap between pipe and wall cut out on the exterior of
a building. Secures to wall. Neoprene ring reduces air infiltration
where pipe slips through. Painted black.
SIZE
STOCK #
A
B
3” x 5”
35CVS-TRO
51⁄8”
8½”
B
Trim Ring, Inner
Conceals gap between pipe and wall cut out on the interior of a
building. Bend tabs to secure. Neoprene ring reduces air infiltration where pipe slips through. Paintable zincalume.
SIZE
STOCK #
A
B
3” x 5”
35CVS-TRI
53⁄8”
8½”
ØA
B
Wall Strap
1
Use to provide support for offsets and horizontal funs. Recommended every 4’ to support vertical vent.
SIZE
STOCK #
A
3” x 5”
35CVS-WS
51⁄8”
ØA
Wall Strap
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FasNSeal | Concentric Vent System
Universal Condensate Drain
Firestop Support
Use to properly manage corrosive condesates common with high
efficiency gas appliances. Port connects to 5/8” drain hoses.
SIZE
STOCK #
3” x 5”
35CVS-CD
Use to support vent at ceiling level.
SIZE
STOCK #
A
B
C
3” x 5”
35CVS-FS
53⁄8”
7 ¼”
9 ¼”
B
ØA
C
FIRESTOP
SUPPORT
Roof Support
Use to support pipe at roof level.
B
SIZE
STOCK #
A
3” x 5”
35CVS-RS
51⁄8”
1
ØA
2
ROOF SUPPORT
Storm ACollar
3"
4"
5"
6"
3-5/8
4-5/8
5-5/8
6-5/8
B
14-3/4
15-3/4
16-3/4
17-3/4
Use to maintain a weather tight resistant seal between the pipe
and the flashing for vertical terminations.
A
B
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SIZE
STOCK #
A
B
3” x 5”
35CVS-SC
51⁄8”
11”
Concentric Vent System | FasNSeal
Adjustable Roof Flashing
Use to weather proof the penetration of vent pipe through the
roof. Fits 0⁄12 - 12⁄12 roof pitches. Storm Collar required.
C
SIZE
STOCK #
A
B
C
3” x 5”
35CVS-F12
5 5⁄8”
16”
16”
A
B
DSA Roof Flashing
Use to weather proof the penetration of vent pipe through the
roof. Fits up to 7⁄12 roof pitch. Storm Collar required. Made of
malliable dead soft aluminum.
C
A
SIZE
STOCK #
A
B
C
3” x 5”
35CVS-DSA
5 5⁄8”
231⁄8”
261⁄8”
B
Vertical Termination
Horizontal Termination
Use for vertical terminations only.
SIZE
STOCK #
3” x 5”
35CVS-VC
Use for horizontal terminations. Telescoping termination is
adjustable. HCS fits 2”x4” walls 5¾” up to 9” thick. HCL fits walls 8”
up to 13” thick. Black outer trim ring included.
SIZE
STOCK #
A
3” x 5”
35CVS-HCS
35CVS-HCL
5¾” - 9”
8” - 13”
3” x 5”
A
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FasNSeal | Concentric Vent System
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What makes us different from the rest?
The Concentric Venting System...Highly Engineered, Lower Cost
Incorporates o-rings on the inner wall
and outer casing to prevent exhaust or
combustion air leakage.
Designed with proprietary twist-lock
connection for faster installations.
Corrosion resistant UL1738 approved
super-ferritic inner vent.
Durable zincalume exterior holds up to
job-site demands.
Multiple pipe lengths and telescoping
pipe extensions eliminate field cutting of pipe.
Limited Lifetime Warranty
FasNSeal | Concentric Vent System
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DuraVent | www.duravent.com
Warranty
®
M&G DuraVent, Inc. (“DuraVent”) provides this limited lifetime warranty for all of its products to the original purchaser, with the exception of Ventinox (lifetime),
DuraBlack (five years) and all Termination Caps (five years). Subject to the limitations set forth below, DuraVent warrants that its products will be free from
substantial defects in material or manufacturing, if properly installed, maintained and used. This Warranty is non-transferable with the exception of Ventinox
which is transferable from the original homeowner to the buyer of the home for a period of ten (10) years. This warranty does not cover normal wear and tear,
smoke damage or damage caused by chimney fires, acts of God, or any product that was: (1) purchased other than from an authorized DuraVent dealer, retailer
or distributor; (2) modified or altered; (3) improperly serviced, inspected or cleaned; or (4) subject to negligence or any use not in accordance with the printed
materials provided with the product as determined by DuraVent. This limited lifetime warranty applies only to parts manufactured by DuraVent.
DuraVent provides the following warranties for its products: One Hundred Percent (100%) of the purchase price or MSRP at time of purchase, whichever is lower,
for 15 years from the date of purchase, and Fifty Percent (50%) thereafter, except for the following limitations: Ventinox liner and components in wood, oil, wood
pellet, and gas installations are warranted at One Hundred Percent (100%) for the lifetime of the original homeowner; Ventinox 316 liner and components for coal
burning installations which are warranted One Hundred Percent (100%) for ten years; all Termination Caps and DuraBlack® are warranted at One Hundred Percent
(100%) for five years, and at Ten Percent (10%) thereafter.
All warranty obligations of DuraVent shall be limited to repair or replacement of the defective product pursuant to the terms and conditions applicable to each
product line. These remedies shall constitute DuraVent’s sole obligation and sole remedy under this limited warranty. This warranty provides no cash surrender
value. The terms and conditions of this limited lifetime warranty may not be modified, altered or waived by any action, inaction or representation, whether oral or
in writing, except upon the express, written authority of an executive officer of DuraVent.
Ventinox WARRANTY CONDITIONS
Liner and Component warranties contained herein are subject to the following conditions: (1) The Liner and Components must be installed according to DV’s
installation instructions; (2) The Liner and Components are used only to line or reline chimneys venting residential appliances for which the liner was intended;
and (3) documented annual inspection of the Liner and Components and maintenance as deemed necessary, beginning one year after the date of installation and
continuing throughout the warranty period, by a Nationally Certified Chimney Sweep or VENTINOX® installer. The Liner and Components warranty is further subject
to compliance with the following requirements throughout the warranty period: The chimney must have a chimney cap and chemical chimney cleaners must not
be used when cleaning the Liner or Components. Plastic-bristle flue cleaning brushes are recommended. Corn, biofuels, driftwood or other wood containing salt,
preservative-treated lumber, plastic and household trash or garbage, or wood pellets containing such materials must not be burned in the appliance or fireplace.
In case of a chimney fire, the chimney must be inspected and approved by a certified Chimney Sweep before reuse. After each annual inspection, maintenance, and
cleaning, the certified Chimney Sweep must fill out and date the appropriate section of the warranty card provided with the chimney liner.
LIMITATIONS ON INTERNET SALES:
Notwithstanding any other terms or conditions of this limited lifetime warranty, DuraVent provides no warranty for the following specific products if such products
are both: (a) purchased from an Internet seller; and (b) not installed by a qualified professional installer: DuraTech®, DuraPlus HTC®, PelletVent Pro®, FasnSeal®, and
DuraVent’s relining products including DuraLiner®, DuraFlex® 304, DuraFlex® 316, DuraFlex® Pro, DuraFlex® SW, and Ventinox®. For purposes of this warranty, a
trained professional installer is defined as one of the following: licensed contractors with prior chimney installation experience, CSIA Certified Chimney Sweeps, NFI
Certified Specialists, or WETT Certified Professionals.
DuraVent reserves the right to inspect defective product to determine if it qualifies for replacement under the terms of this limited lifetime warranty. All warranty
claims must be submitted with proof of purchase. Labor and installation costs are not covered under this warranty. To obtain warranty service contact DuraVent
promptly at DuraVent Warranty Service, 902 Aldridge Rd., Vacaville CA 95688, or call 800-835-4429.
WHERE LAWFUL, DuraVent DISCLAIMS ALL OTHER WARRANTIES, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. IN NO EVENT WILL DuraVent BE LIABLE FOR INCIDENTAL, CONSEQUENTIAL, PUNITIVE OR SPECIAL DAMAGES OR DIRECT OR INDIRECT LOSS OF
ANY KIND, INCLUDING BUT NOT LIMITED TO PROPERTY DAMAGE AND PERSONAL INJURY. DuraVent’S ENTIRE LIABILITY IS LIMITED TO THE PURCHASE PRICE OF THIS
PRODUCT. SOME STATES DO NOT ALLOW LIMITATIONS ON IMPLIED WARRANTIES, OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO
THE ABOVE LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO YOU. THIS LIMITED WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER
RIGHTS THAT VARY FROM STATE TO STATE.
For the most up-to-date installation instructions, see www. duravent.com
REV 10.20.2010
M&G DuraVent, Inc.
Manufactured in Vacaville, CA and Albany, NY.
800-835-4429 | DuraVent 10
800-835-4429
Fax: 707-446-4740
www.duravent.com
L353 6/2011
©2011 M&G DuraVent, Inc.
Made in the USA