I heard it is backwards compatible.......however I'll make a call and get you a post later. Why would anyone make something that fits things from the previous generation????? That is why Matt and Dave can move forward in these difficult times. They should call Chrysler, Ford and GM for starters.....there is a concept we can live with!
The newer fan is 50 cfm and as of yet we do not have a compatible flange to replace the standard B30 Fasco, however I am working to get the manufacturer to make us a part number so it will fit all the 90K and 70K feeder bodies. Will keep you all posted as parts are available. Thanks for the interest!