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935SB: Installation, Start-up, Operating and Service Maintenance Instructions
.
Vent and Combustion
1 1/2-in.
Air Pipe Diameters
(38 mm)
1 1/2-in. (38 mm)
2-in. (51 mm)
2 1/2-in. (64 mm)
3-in. (76-mm)
4-in. (102 mm)
Table 15 – Approved Combustion-Air and Vent Pipe, Fitting and Cement Materials (U.S.A. Installations)
1. All pipe*, fittings*, primers**, and solvents** must conform to American National Standards Institute (ANSI) standards and
American Society for Testing and Materials (ASTM) standards
USA
2. See Table below for approved materials for use in the U.S.A.
3. UL 1738 vent systems must be composed of pipe*, fittings**, cements, and primers** from the same supplier.
Material
Description
Pressure Pipe
DWV
SDR 26
PVC
SDR 21
IPEX
Royal Pipe
ABS
ABS
DWV-IPS Sizes
Pressure Pipe
SDR
CPVC
IPEX
Royal Pipe
* PVC and ABS pipe may use either DWV or pressure rated fittings.
** Colored or tinted solvents or primers must be used where required by code in the USA
† ABS plastic does not require a primer before solvent cementing. A cleaner for ABS is recommended to remove any surface residue. ABS cleaners are
not subject to ASTM standards.
Polypropylene
Poly Pro®
Innoflue®
NOTE: Polypropylene vent systems are UL−1738 and ULC S636 listed and assembled using mechanical fastening systems supplied by the vent
manufacturer.
Venting Systems
Direct Vent / 2-Pipe System
!
RECOMMENDED SUPPORT FOR VENT
TERMINATION
It is recommended that sidewall vent terminations of over 24 inches
(0.6 M) in length or rooftop vent terminations of over 36 inches (1 M)
in length be supported by EITHER the factory accessory vent
termination kit or field-supplied brackets or supports attached to the
structure. A factory accessory vent termination kit may be used for
direct vent terminations. Termination kits are available for 2-in. or 3-in.
pipe. For available options
(Table
In a direct-vent (2-pipe) system, all air for combustion is taken directly
from outdoor atmosphere, and all flue products are discharged to outdoor
atmosphere. Combustion-air and vent pipes must terminate together in
the same atmospheric pressure zone, either through the roof (preferred)
or a sidewall. For references to clearances required by National code
authorities (see
Fig.
46).
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 14 – Vent Termination Kit for Direct Vent (2-pipe) Systems
Approved Two-Pipe Termination Fittings
2-in.
2 1/2-in.
(51 mm)
(64 mm)
No
Yes
No
Yes
No
No
No
No
No
No
Type
Schedule 40
D1785 / UL 1738
Schedule 40
D1785 / D2665
N/A
N/A
Schedule 40
Schedule 40
Schedule 40
Schedule 40
Schedule 40
N/A
Schedule 40
Schedule 40
Approved Manufacturer
M & G Dura Vent
Centrotherm
NOTICE
14.)
3-in.
(76-mm)
(102 mm)
No
No
No
No
No
Yes
No
Yes
No
Yes
MATERIALS
ASTM / ULC / UL Specification
Pipe*
Fittings*
D2466 or D2665
D2241
D2241
ULC S636
ULC S636
ULC S636
ULC S636
D2661
D2468
D2661
D2661
F441
F438
F442
N/A
ULC S636
ULC S636
ULC S636
ULC S636
OPTIONAL CONFIGURATION FOR COMBUSTION
AIR INLET PIPE
In applications where there is a risk of excessive moisture entering the
combustion air inlet pipe, a moisture trap may be added to the inlet pipe
to help prevent moisture from entering the furnace from the combustion
air inlet pipe. (see
When sizing venting systems, the equivalent length of the optional inlet
pipe moisture trap must be taken into account.
Ventilated Combustion Air Systems
In a ventilated combustion air option, the vent terminates and discharges
the flue products directly to the outdoors similar to a direct vent system.
References to clearances required by National code authorities (see
Fig.
47)
All air for combustion is piped directly to the furnace from a space that is
well ventilated with outdoor air (such as an attic or crawl space) and the
space is well isolated from the living space or garage. Combustion air
requirements for this option are the same as the requirements for
providing outside air for combustion for a single pipe vent system. Refer
to the "Air For Combustion and Ventilation" Section.
29
Allowable Concentric
4-in.
Vent Kit
No
2-in. (51 mm)
No
2-in. (51 mm)
2-in. (51 mm)
No
3-in. (76 mm)
No
3-in. (76 mm)
Yes
3-in. (76 mm)
Solvents/Primers**
F656
ULC S636
ULC S636
Clear Cleaner For
ABS†
F656
ULC S636
ULC S636
Solvents Primers
Not Permitted
Not Permitted
NOTICE
!
Fig.
52)
Concentric Vent Kit
KGAVT0701CVT
KGAVT0701CVT
KGAVT0701CVT
KGAVT0801CVT
KGAVT0801CVT
KGAVT0801CVT
Cements
D2564
ULC S636
ULC S636
D2235
F493
ULC S636
ULC S636
Cements
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