Exhaust or Supply Propeller Fan Axial Flow Roof Ventilators. Airettes can be used as an efficiant power roof exhauster to remove hot, humid, foul air or can be arranged to supply fresh, cooler outside air.
Features:
Hooded, Roof-Mount Propeller Fans
Direct or Belt Drive
Application: Supply Fresh Air or Exhaust Hot, Humid, and/or Foul Air
Capacity: Up to 72,755 cfm; 0 - 0.5” w.g.
Models:
AC: Cast Aluminum Prop., Belt drive, sizes AC24 - AC72
AC_W,T: Cast Aluminum Prop., Direct drive, sizes AC24W1 - AC48W2
AF: Fabricated Steel Prop., Belt drive, sizes AF24 - AF60
E-Catalog 
