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Venting
INSTALLATION INSTRUCTIONS
Venting for Direct-Vent Water Heater (cont.)
Horizontal Vent Installation
WARNING:
Danger of fire or bodily injury – Solvent cements and
primers are highly flammable. Provide adequate ventilation
and DO NOT assemble near heat source or open flame. DO
NOT smoke. Avoid skin or eye contact. Observe all cautions
and warnings on material containers.
CAUTION:
Use tankless water heater manufacturer-approved Schedule
40 PVC (foam core is not permitted at any time), Schedule
80 PVC, CPVC, ABS or UL 1738-listed Category III Stainless
Steel or InnoFlue
®
PP. No other vent material is permitted.
For Canada, installations must follow ULC S636 for exhaust
venting.
Joining Pipes and Fittings
All pipe, fittings, solvent cement, primers, and
procedures, for the U.S., must conform to American
National Standards Institute and American Society
for Testing and Materials (ANSI/ASTM) standards.
For Canada, all pipe, fittings, solvent cement,
primers, and procedures must conform to ULC-S636
and vent manufacturer specifications.
CAUTIONS:
• DO NOT use solvent cement that has become curdled,
lumpy, or thickened.
• DO NOT thin solvent cement. Observe shelf precautions
printed on the containers.
• For applications below 32°F, use only lower temperature-
type solvent cement.
• Appropriate solvent and cleaner must be used for the type
of vent pipe used (PVC, CPVC, or ABS).
Cleaner-Primer and Medium-Body Solvent Cement
All joints in vent piping must be properly sealed, and
we recommend using the following material:
PVC materials should use ASTM D-2564-grade
cement.
CPVC materials should use ASTM F-493-grade
cement.
ABS materials should use ASTM D-2235-grade
cement (ABS is not allowed for exhaust vent in
Canada).
Cementing Joints
1. Cut pipe end square; remove jagged edges and
burrs. Chamfer end of pipe and clean fitting socket
and pipe joint area of all dirt, grease, or 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.
3. Apply a thin coat of cement evenly in the socket.
Quickly apply a heavy coat of cement to the pipe
and insert pipe into fitting with a slight twisting
motion until it bottoms out.
4. Hold the pipe 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 will
vary according to fit, temperature, and humidity.
NOTICE:
• Cement must be fluid; if not, recoat with fresh cement.
• Stir the solvent frequently while using. Use a natural
bristle brush or the dauber supplied with the can. The
proper brush size is one inch.
• DO NOT use cement for InnoFlue® PP.
Exhaust Vent Pipe
12” (30 cm)
Minimum
Air Intake Pipe
Wall Plate
(recommended)
Inspection
Access Panel
(Optional)
Inspection
Access Panel
(Optional)
Ceiling
Upward Slope
to Termination
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