I recently purchased a new r f smoker from Greasyhillcustomgrills and can not get it over150.I have learned so much from this forum already just wish I would have seen it before the purchase. I have the model 400 with warming / rib box. I have read the other posts on smokers similar to this and checked out the calculator. I believe my problem is the fire box needs to be lowered about 10"-12". This is not a option because the FB sits on the tounge of the trailer. Is it possible to put small fans in the air intake for FB and force air threw the smoker........please help I am desperate......