Combustion Air Question - Conroe TX

[Cowboy81]

Quick Scernio - We have 8 furnaces in an equipment closet that are on one solid horseshoe platform. I need to know if according to code my combustion air has to be within 12" from the hard floor, or 12" within 12" of the platform. I know that in a normal closet (reach in type with nothing but the furnace in it) the answer would be within 12" of the platform, because there is no hard floor, but my GC is saying that I have to bring it down to the floor. I have already passed all my local inspections, but have to have a state inspection because of the building type (retirement center). Any insite would be much appreciated because I don't have my code books with me (if possible send where in what code book your answer is based on.)

[Jerry Peck - Codeman]

[Nolan Kienitz]

Just for the sake of additional information I would ask your GC for the precise basis of his comment to you. I'm not saying he is wrong, but rather so you can both be on the same song-sheet about what is being discussed.

Based upon what I've read the combustion air vent would have to be at the hard-floor level. As Jerry noted in a typical closet there is air coming into the space below the deck the units are sitting on as the space below the deck is often a return air plenum chamber.

If you have passed all local code inspections from City of Conroe and you have yet to pass a state inspection ... I would endeavor to find out precisely what they will be inspecting for (in advance) so that you and the GC can be sure everyone is on the same page.

I am also an ICC-certified code inspector and agree with Jerry and your GC that the vent needs to be at ground level.

Again ... communication is key. Get with your GC to learn where he is coming from. Is it experience or has a code inspector mentioned something? I'm surprised that your GC is saying this needs to occur, yet you indicated you have passed all local code inspections.

Did someone miss something or is the state inspection different?

[Cowboy81]

Hey gentlemen, Thanks for your input in this matter. We found a way to get our combustion air all the way to the floor - Not exactly how we wanted to do it, but it will work..


Brandon