from your air return. its the grill located centrally that sucks air in. it sucks air into the furnace exchanger and out through the vents. when you turn fan on, no fire, just the fan running.
so If I wanted to get my hot basement air to heat up my house, venting it into the furnace room and putting the furnace on fan mode wouldnt help right?
so If I wanted to get my hot basement air to heat up my house, venting it into the furnace room and putting the furnace on fan mode wouldnt help right?