Thanks Vic, It looks like Fan-Tastic is now Dometic. So I got a Dometic model 1450, it fits in the opening and wiring matches up. However, it has some strange exterior clips and the outside dimension on the exterior flange where it fastens down to roof is 16-1/2", whereas the original fan is 17". The 17" provides more coverage over the opening for sealant, etc. I am thinking of going with a Dometic model 2250, but having a hard time finding out the exterior flange dimension? Guess I'll call Dometic Corp. and find out. I really was hoping to get lucky and find the exact model with same specs, etc. that was used when they built my 2007 Alaskan, most likely discontinued.... I did send an e-mail to Alaskan Camper, but no response? Anyway, I will soldier on. Thanks again.
Jim