Originally Posted By: Joe Funderburk
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OK, I’m a slow learner.
Here's another gas furnace in a closet from today's inspection. It was a Ducane--model number was illegible. "Direct vent forced air" furnace.
Here's what puzzles me: an opening was on top of the unit where I think the PVC pipe for combustion air should be secured--it was not there. You could see the flames clearly through this opening. The return was on bottom left of the unit--no duct to outside; also drawing air from inside closet. The closet door was louvered, but the top section of the louvers was covered. The lower part of the closet door had a filter installed. There is no other entry for combustion air--all air comes in through the filtered door.
It seems to me that if all the combustion air comes in through the filter this is incorrect. Doesn't the return air and combustion air mix because of this arrangement? Even if there was sufficient louvered area, is it OK to have the return air and combustion air mixed together in a closet???
I appreciate your help. HVAC isn't my strong suit.
[ Image: http://www.nachi.org/bbsystem/usrimages/1/112505_045.jpg ]