I recently replaced my blower motor with a newer one, this one is a 1/2 HP 1725rpm single stage (It doesn't appear to have low or high it just goes one speed. The old one had Low/Mid/Hi speeds). I have noticed I don't get a lot of air flow coming out of the vents like with the old motor. I have cleaned the furnace, checked the ducts, and the airflow is still less than ideal. I'm curious if I can change pulleys on the blower unit itself to make it spin faster.
Currently the motor has a 4" pulley, and the blower has a 7" pulley on it, with a 17" belt. Could I put a 5" pulley on the blower unit? I was doing some math with and I'm getting 985rpm with that setup (I think? I'm not a engineer and my math skills suck). Would it make a difference?
I've read of other people changing pulleys without an issue. I don't want to overstress the motor or blow it up, as I just bought it.
Any info would be great.