groundhogy wrote:
hmmm...
There is a single blower motor with two fans. I guess one for the outside of the firebox to blow air over the firebox to the ducts, and the smaller to I guess evacuate the inside of the firebox?
If so, the inside fan would move air faster also.
The firebox and burner are sealed from interior air on an RV furnace. They have to be or you'd have a Co issue in the camper. If there are 2 blower wheels, both have to do with room air not combustion.
Same applies to your home furnace. Firebox is sealed from room air, always.
