SSI rotors

I'm sure somebody brought this up before, but just couldn't find it.
How can you tell which type of rotor is in a 14-71 HH SSI blower. As far as I know we're running F-rotors, but I never bothered checking and have no idea how to. They might just as well be C, D, or DD.
Second question of course is what's the difference in performance if you run it at 50% over.

Thanks.
Marcel

 

the best way is to call TJ or Rich.....and give then the serial number on the blower case. it should be on top near the back where the hat bolts to the top of the blower. 1-216-676-5800
hope this helps

 

Thanks Darren,
I'm sure the phone number will come in handy in the future. In the meantime we opened it up and found an F stamped on the front side of the rotors.
Question answered.

 

Unless the "F" means for Front >>>>>>...






.