Alan,
What kind of material is in yout blade?
Glenn, Billy's last name is Merritt. He wanted me to email you a while back to tell you but could'nt get thru.
Thanks, Steve
I agree with H. Woolridge on the size. I used 14" spiral duct with a side draft straight thru the roof. You can't hardly crank fast enough that it won't take all the smoke. I wouldn't change a thing on mine. My 2 cents.
Steve