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?
1 watt = about 3.4 btu
so 1000 watts = 3400 btu
200 watts = 680 btu
thus the s-7 is close to a 4000btu heater
the cfm is about 200 at 4000 rpm fan speed