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Comparison : Item # 1924-B-1/4, 780 Revolutions Per Minute (rpm) Fan Speed Hooded Model 1900 B Roof Exhaust or Supply Ventilator
Item # 1924-B-1/2, 980 Revolutions Per Minute (rpm) Fan Speed Hooded Model 1900 B Roof Exhaust or Supply Ventilator
Item # 1924-B-3/4, 1140 Revolutions Per Minute (rpm) Fan Speed Hooded Model 1900 B Roof Exhaust or Supply Ventilator
Item # 1924-B-1, 1250 Revolutions Per Minute (rpm) Fan Speed Hooded Model 1900 B Roof Exhaust or Supply Ventilator
Item # 1930-B-1/3, 595 Revolutions Per Minute (rpm) Fan Speed Hooded Model 1900 B Roof Exhaust or Supply Ventilator