Blower fan body needs to be extremely hot for blower motor to turn on; recommend bypassing thermistor so fan runs when switch is "on." Fresh air kit assumes air plate with screws is on shell; unit now manufactured with knock-out panel rather than screwed cover plate - need to include screws w/ kit or state, as with flue kit, that screws are not included. Pre-thread screw holes in shell, some holes under-sized; takes a lot of force and repeated threading/unthreading of screw to cut threads into shell. Offer screws for sale or specify size/type/thread count. Flue liner kit comes only with square top plate; request option with plate sized for common clay flue liners (17"x8").