Customer Service
502,503,504,505,508,509,510,511,512 UTILITY FANS* note old style units had a 2 holemounted grille - new style has centreknob mounted grille - new style isidentified with a “B” suffix99020166Broan blademodel 502/4/8/10 incl BFits "REG" Shaft9-3/8".
Customer Service
1.888.467.7626