fresh air intake requirements

sriegel

hi all,
i'm getting a hi-efficiency Heil furnace installed to replace an old unit. it's in the garage. do i need to take fresh air from outside, or can i use the garage air? we're in the temperate NW.
thanks,

kenmac

This depends on the size of the garage & what is required in your area. Your installer should know the requirments for your area & your situation. In my area. no outside air is required if the garage area is large enough. If it's a 90 % furnace. there should be a pipe for combustion air & 1 for exhaust

sriegel

thanks,
well, my old house used both intake and exhaust, but it was in my finished basement. i'm just wondering cuz he said we'd just unhook the old exhaust and that would supply enough combustion air. i've got about 550 square feet of attached garage. if it's strictly a volume requirement, i'm okay with it. i wasn't sure if it's a strict requirement for 90+ furnaces.

kenmac

xxx combustion air per xxx BTU. I like to use both pipes 1 for exhaust the other for combustion air. Some use single ( a pipe within a pipe ) which does the same thing

sriegel

found it in the installation manual. we'll make sure we give 'er enough air.
thanks again for the help.

yuri

There may be some local code requirements as to how high off the floor it has to sit. Hopefully the installer checks them out. Has to do with explosive fumes at floor level if there is a gasoline leak etc. A 2 pipe system would be safer.

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kenmac

We had that problem here until some manfactures starting enclosing the blower motor compartment

yuri

If he does any wood working or dusty work in the garage I would recommend the 2 pipe system so it stays cleaner inside the furnace. And a sealed air filter box. A 2 pipe system is safer as no fumes or dust can enter the burner box.

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