Lomanco 1800 Power Ventilators, MillAll aluminum construction. Balanced blades pitched for smooth operation and high volume air removal. Five blades with 12" diameter. Factory set adjustable thermostat (switches on at 100 degrees and off at 85 degrees). Thermostat features a "push to test" button. Can be mounted in horizontal or vertical positions on either 16" or 24" center framing members. Designed to mount behind existing gable louver. Highlights: Motor: 1 10 HP; 1100 RPM; 3. 4 Amps;