I'm trying to build ducting to get heat from 4 s7s out of the basement through the exhaust for the dryer and want to know if it's big enough or needs to be widened? Should the exhaust have it's own fans pulling air?
I would add a fan to pull the air. The 200 cfm from the S7s isnt strong enough to push air that far and make a difference. I found the air gets trapped. A simple fan 300-500 cfm thats quiet will suck the air and heat the rooms nicely.