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Old 10-16-2009, 05:28 PM   #1
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Join Date: May 2008
Location: Rochester, NY
Posts: 107
Question Want to install combustion air venting

I have a natural gas furnace that is power vented and uses the basement air for combustion, its a 1993 Heil furnace. Sticker inside says input BTU is 75,000 and output is 59,000. I want to install a duct that is located about 1 foot off the floor near the furnace to help supply combustion air to the furnace. I am thinking of installing 4 inch duct that is vented from the outside and has a motorized damper that opens when the furnace runs.

Is 4 inch sufficent?
Is a motorized damper needed or is there a passive type that would work?
Should the ducting be rigid and insulated?
Should a fan be installed to increase air movement toward the furance end?

Thanks for any input
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