fuccillo111 wrote:Maybe it would be more effective to leave one side open to let it draw as much as it wants from the basement.
I would advise against that.. Heres why.. Imagine your furnace adds 50 degrees to the air coming in thru the cold air return. The air in the cold air return may be 65 degrees + the 50 that the furnace adds = 115 dgree air coming out at the warm air registers in the house.
Now lets try drawing air off the basement floor that may be only 50 degrees + the 50 the furnace adds = 100 degree air coming out at the warm air registers..
I cannot stress enough the loss of efficiency thats going on when people don't have a cold air return and instead pull cold air off the basement floor, pressurizing their house and ultimately loosing that warm air because the air flow replacement is all wrong
fuccillo111 wrote:This would also "draw" more air towards the combustion fan right?
No, actually quite the opposite if the basement is tight. The negative pressure created by taking air out of the basement thru the blower thats disconnected from the cold air return would actually cannibalize your combustion AND chimney draft.
I dont understand how you can have too much blower. I don't think there can be too much blower unless of course it is causing a high wind in your house thats making yer dinner go cold too fast