13
UEZ-IOM (07-23) 1034347-I
Vent/Combustion Air System Piping Joints
Vent/Combustion Piping Joints (Unit Sizes 055–110)
All vent/combustion piping joints for unit sizes 055, 085, and 110 must comply with the vent system manufacturer’s
requirements.
Vent/Combustion Piping Joints (Unit Sizes 130–310)
NOTE: If using a UL-1738-listed Category IV venting system in the US or a ULC-S636-listed Cat-
egory IV venting system in Canada, follow the instructions provided for that system.
When ready to install the vent system, ensure that piping joints are in accordance with the following:
• Combustion air piping: secure slip-fit joints of single-wall combustion air pipe using sheet metal screws or rivets.
Seal joints and seams with aluminium tape or silicone sealant.
• Vent piping: the vent system should be installed in a manner consistent with normal industry standards and in
compliance with all local fire and building code requirements. Failure to follow proper installation practices, procedures,
or techniques can result in system failure, property damage, or personal injury. The installer is responsible for the
installation. Read the following procedure before beginning installation:
NOTE: Install piping joints one at a time. Pipe and fittings should be assembled quickly while
cement is fluid.
1. Cut pipe square—angled cut may result in joint failure:
a. Remove all burrs from inside and outside diameter of cut end of pipe burrs using deburring tool, file, or knife
edge.
b. Chamfer (bevel) end of pipe 10 to 15 degrees.
c. Remove surface dirt, grease, and moisture from pipe sections and fittings using clean dry cloth.
2. Check for proper fit—test fit using light pressure:
a. Install dry pipe one-half to one-third of way into fitting hub.
b. Ensure that pipe and fittings are not too tight or too loose.
3. Apply primer to pipe and fitting surfaces using 2- to 3-inch applicator brush:
a. Ensure that primer conforms to ASTM F656.
b. Ensure that primer does not puddle inside system.
4. Apply cement using 2- to 3-inch applicator brush, quickly assembling joint while cement is fluid:
a. Ensure that cement conforms to ASTM D2564.
b. Apply full even layer of cement to pipe OD slightly greater than depth of socket on coupler (fitting).
c. Coat coupler (fitting) socket with medium layer of cement, ensuring that cement does not puddle inside system.
d. Apply second full even layer of cement to pipe OD.
5. Join pipe and coupler (fitting):
a. Working quickly while cement is fluid, insert pipe into coupler (fitting) until it touches socket bottom.
a. Turn pipe quarter turn and hold joint together until pipe will not pull out.
b. Clean excessive cement from exterior—properly made joint will have continuous bead of cement around
perimeter.
To Next Page
Loading...
Need help?
General
