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AM Series Boiler & Water Heater User Manual
CHAPTER 6: INSTALL – VENT & COMBUSTION AIR PIPING
6.5.18 Vertical Vent and Air Roof Termination Preparation
Prepare for installation of vent and air termination into a roof as follows:
Vertical Vent and Air Roof Termination Preparation
1.
Air pipe penetration: cut a hole for the air pipe, sizing the air pipe hole as close as desired to
the air pipe outside diameter.
2.
Vent pipe penetration:
3.
Cut a hole for the vent pipe. For either combustible or noncombustible construction, size the
vent pipe hole with at least a 1/2 inch clearance around the vent pipe outer diameter;
4.
Insert a galvanized metal thimble in the vent pipe hole.
5.
Space the air and vent holes to provide the minimum spacing shown in Figure 6-11 and
listed in Section 6.5.16.
6.
Follow all local codes for isolation of vent pipe when passing through floors, ceilings, and
roofs.
7.
Provide flashing and sealing boots sized for the vent pipe and air pipe.
6.5.19 Installing Vertical Vent and Air Roof Terminations
Install vent and air terminations into a roof as follows:
Installing Vertical Vent and Air Roof Terminations
1.
Prepare the vent termination and the air termination elbow (Figure 6-11) by inserting bird
screens.
2.
The air piping must terminate in a down-turned 180° return bend as shown in Figure 6-11.
Locate the air inlet pipe no further than 2 feet from the center of the vent pipe. This
placement avoids recirculation of flue products into the combustion air stream.
3.
Maintain the required dimensions of the finished termination piping as shown in Figure 6-11.
4.
Do not extend exposed vent pipe outside of building more than shown in Figure 6-11.
Condensate could freeze and block vent pipe.
OMM-0100_E • GF-146 • 11/15/2019
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
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