Hi, I'm in the process of building a HM4 and had a question about the blower. I'm planning on using on a large backwoods smoker - approx 6'w x2.5'd x 3'h and am currently using an old bbq guru. It has a 25cfm fan. My question is will the one spec'd out be enough for such a big smoker? If I wanted to upsize the fan, what would be required? I see most larger fans draw quite a bit more amps.