I have an open fire pit inside of a shelter at my hunting camp. I just finished building the pit out of stone and I had a tin man make a hood and pipe it out the roof for me. The pit is circular and about 4' across, the hood is square and slightly larger. The pipe going out is 16" round and 20' long.
I put my first fire in it the other night and the natural draft wasn't enough to exhaust the smoke. The shelter began filling with smoke and we had to put the fire out and get the hell outta there. It was clear that I have to come up with something to pull that smoke up the pipe.
I was talking with the tin guy who intalled it and he figures that it needs a heat tolerant fan that'll pull about 3800 cfm to get rid of the smoke. I think that sounds excessive but I don't know much about sizing these things... My cost on the fan is about $1,700 so that is also discouraging.
What do you guys think that I could rig up in order to make this thing work? Is it necessary to have a high heat tolerant fan? How many CFM?