Aerovent Model 500AW-WHB-3617-30 Blower

Aerovent Model 500AW-WHB-3617-30 blower having an 11" ID inlet,10" x 10" outlet and approximately a 28" impeller. Impeller is belt driven by a 30 HP DC motor with blower. Type MHB.S/N-85-0058701. Mfg 1985.