Return air duct

jmacina

sorry my friend but if you have cold air blowing out something is really wrong but i belive you think it is blowing when it is really sucking in...

Lorenzo

I have a gas hot air furnace and my question is, when my heater is on hot air comes out of the supply duct while cool air blows out of my return ducts. Is this how it works?

Paul Mitchell

cold air

hold a piece of paper or tissue over the return duct. it may feel like it is blowing but the paper should get sucked in. if not then i think somehow a duct is disconnected and you are pulling in cold outside air.

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jmacina