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AM Series Boiler & Water Heater User Manual
CHAPTER 6: INSTALL – VENT & COMBUSTION AIR PIPING
6.5.8 Combustion Air and Ventilation Openings
Outdoor combustion air shall be provided through opening(s) to the outdoors.
WARNING!
Make sure that combustion air and ventilation openings are sufficiently sized and no
reduction or closure of openings takes place.
6.5.9 Two Permanent Openings Method
Two permanent openings, one commencing within 12 inches (300 mm) of the top and one
commencing within 12 inches (300 mm) of the bottom, of the room shall be provided. The
openings shall communicate directly, or by ducts, with the outdoors or spaces that freely
communicate with the outdoors, as follows:
•
Where directly communicating with the outdoors or where communicating to the outdoors
through vertical ducts, each opening shall have a minimum free area of 1 in2 each 4000
Btu/hr (550 mm2/kW) of total input rating of all appliances located in the room.
•
Where communicating with the outdoors through horizontal ducts, each opening shall have
a minimum free area of 1 in2 each 2000 Btu/hr (1100 mm2/kW) of total input rating of all
appliances located in the room.
6.5.10 One Permanent Opening Method
One permanent opening, commencing within 12 inches (300 mm) of the top of the room, shall
be provided. The appliances shall have clearances of at least 1 inch (25 mm) from the sides and
back and 6 inches (150 mm) from the front of the appliance. The opening shall directly
communicate with the outdoors or shall communicate through a vertical or horizontal duct to the
outdoors or spaces that freely communicate with the outdoors and shall have a minimum free
area of 1 in 2 each 3000 Btu/hr (700 mm2/kW) of the total input rating of all appliances located
in the room.
6.5.11 Installing Vent and Air Piping into Sidewall
Install vent and air piping through sidewalls as follows:
Installing Vent and Air Piping into Sidewall
1.
Install air pipe through wall: Cut a hole for the air pipe. Size the air pipe hole as close as
desired to the air pipe outside diameter.
2.
Install vent pipe through wall:
a)
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;
b)
Insert a galvanized metal thimble in the vent pipe hole as shown in Figure 6-6.
3.
Use a sidewall termination plate as a template for correct location of hole centers.
4.
Follow all local codes for isolation of vent pipe when passing through floors or walls.
5.
Seal exterior openings thoroughly with exterior caulk.
OMM-0100_E • GF-146 • 11/15/2019
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Page 75 of 170
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