it s an ordinary blower, with low pressure (@10 psi 464 F).
to be conservative , i have to consider NEMA requirements.
the issue right now is to select the suitable and the most economical ones.
have you done similar analysis. ( inlet and exhaust blowers large diametre 66").
In a way that i don t have to follow NEMA, I would appreciate if you do have any allowable loads on blowers (guide lines).
Regards
Yani.