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Tom McDonnell
08-06-2007, 05:17 AM
Chapter 17 IRC requires an inlet and an outlet duct (one near ceiling/one near floor) for purpose of providing combustion air. Yet, I continually see one duct only in in ceilings of garages and laundry rooms. Could all of these be incorrect? Any info will be appreciated.

Jerry Peck
08-06-2007, 06:32 AM
Tom,

Do they meet this?

From the IRC.

G2407.6.2 (304.6.2) One-permanent-opening method. One permanent opening, commencing within 12 inches (305 mm) of the top of the enclosure, shall be provided. The appliance shall have clearances of at least 1 inch (25 mm) from the sides and back and 6 inches (152 mm) from the front of the appliance. The opening shall directly communicate with the outdoors or through a vertical or horizontal duct to the outdoors, or spaces that freely communicate with the outdoors (see Figure G2407.6.2) and shall have a minimum free area of 1 square inch per 3,000 Btu/h (734
mm2/kW) of the total input rating of all appliances located in the enclosure and not less than the sum of the areas of all vent connectors in the space.

Michael Thomas
08-06-2007, 08:16 AM
Combustion Air Sources

DavidR
08-06-2007, 02:20 PM
Now for the next question; do they really work? ;)

Bob Mayer
08-06-2007, 02:54 PM
Combustion Air Sources

Note that this table Michael cites uses the incorrect units of BTU instead of BTU/h. Using BTU instead of BTU/h seems to be getting more common.

- BOB

Tom McDonnell
08-06-2007, 03:08 PM
Thanks Guys for the info. Don't know how I ever got along without you.

Michael Thomas
08-06-2007, 04:23 PM
"Note that this table Michael cites uses the incorrect units of BTU instead of BTU/h. Using BTU instead of BTU/h seems to be getting more common."

Bob,

Head right on over to Ft. Collins, and bust their chops: :D

http://fcgov.com/nbs/pdf/basement.pdf