Here is a late 40" model at
Amazon with the vent on top ...
I had previously contacted
Masterbuilt about this model and they said ..."The models 20072612 (Sams) and 20070512 (other retailers) are the exact same model smoker but, for different retailers they have different model numbers. But, there is absolutely no difference between these two smokers. The model 20075315 (
Amazon) is also exactly the same design as the other models but, all of the part are replaceable on this model as they are not on the other models. The mother board, wiring and all is now replaceable on this uni-body smoker. Other than the parts being replaceable there is no difference! "