Coal Berner is right that it's all in the manual on the EFM web page. I ran into some clearance to combustibles. I had to put up a heat shield (sheet metal spaced 1 inch from wall). I also had clearance problems with the exhaust pipe. It must be 18 inches from combustibles. Due to an original home construction issue, the chimney thimble was way to close to combustibles. I had to rip down sheetrock and wood studs and replace with metal studs and concrete board. Make sure you talk to your local code guy before putting it in the final resting place. You don't want to be moving that thing once it's installed. Better to make sure the measurements are right only once.