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GENERAL VENTING REQUIREMENTS AND
VENTING & COMBUSTION AIR REQUIREMENTS (cont.)
wrap the vent pipe with self-regulating 3 watt or 6 watt
heat tape. The heat tape must be U.L. listed and in-
stalled per the manufacturer's instructions. NOTE:
Never cover heat tape with insulation.
5. The minimum vent pipe length is 5 feet [1.5m].
6. IMPORTANT: No part of the combustion air and/or
vent pipes may be installed underground.
7. Piping at a roof, wall or other penetration must be im-
mobilized to prevent pipes from disconnecting. Dis-
connected pipes may allow flue products to be
released inside the structure.
8. For Direct Vent systems, all pipe penetrations through
roof or sidewall must be installed so that the vent and
combustion air intake pipes terminate in the same at-
mospheric pressure zone.
9. Vent terminations must be installed with the minimum
clearances specified in the TERMINATION REQUIRE-
MENTS sections of this manual and Figure 21 (for
Non-Direct Vent) and Figure 32 (for direct Vent instal-
lations).
10. Piping external to the structure (excluding approved
venting terminations) and vent passing through un-
heated crawl-spaces, attics, verandas, patios or decks
must be insulated with approved insulating material to
prevent freezing as required for local climate.
JOINING PIPE AND FITTINGS
All pipe, fittings, solvent cement, primers and procedures
must be installed following the vent manufacturer's instal-
lation instructions and must conform to American National
Standards Institute and American Society for Testing Mate-
rials (ANSI/ASTM) standards as shown in the Table 2
below:
%
$
(U.S. Only)
89
(
12345167
5:3
5:3
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For Canadian installations all exhaust venting materials must be certified to
ULCS-636C.
366
;43
;6?
5:3
$5225<=7
45>34
3>3<2
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CEMENTING JOINTS
Properly seal all joints in the PVC vent using the following
materials and procedures.
PVC CLEANER-PRIMER AND PVC
MEDIUM-BODY SOLVENT CEMENT
IMPORTANT: After cutting pipe, remove all ragged edges
and burrs. This is important to prevent reduction in pres-
sure drop throughout the system.
1. Cut pipe end square. Chamfer edge of pipe. Clean fit-
ting socket and pipe joint area of all dirt, grease and
moisture.
2. After checking pipe and socket for proper fit, wipe
socket and pipe with cleaner-primer. Apply a liberal
coat of primer to inside surface of socket and outside of
pipe. Read instructions included with the primer for
proper application.
3. Apply a thin coat of cement evenly within the socket.
Quickly apply a heavy coat of cement to the pipe end
and insert pipe into the fitting with a slight twisting
movement until it bottoms out.
NOTE: Cement must be fluid. If not, re-coat.
4. Hold the pipe in the fitting for 30 seconds to prevent the
tapered socket from pushing the pipe out of the fitting.
5. Wipe all excess cement from the joint with a rag. Allow
15 minutes before handling. Cure time varies accord-
ing to fit, temperature and humidity.
NOTE: Stir the solvent cement frequently while using. Use
a natural bristle brush or the dauber supplied with the can.
The proper brush size is one inch.
IMPORTANT: For proper installation:
DO NOT use solvent cement that has become curdled,
lumpy or thickened.
DO NOT thin. Observe shelf precautions printed on
containers. For applications below 32°F, use only low-
temperature type solvent cement.
GUIDELINES
47
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