I installed my c160 insert into a zero clearance fireplace using a ventinox 6 inch offset adapter and about 20 feet of olympia stainless liner. My stove rarely get up to 400 degree's. I have experimentent with several kinds of woods and stacked wood several different ways. I keep hearing on this site people having trouble keeping there temparature down. Im only using about 2 inches of the 6 inch offset and there appears to an excellent draft and all seams appear completely tight. Could it be the offset adapter( if so ill have to live with it) any suggestions Stiker C160 insert now by Lennox