This Cool Attic Roof Mount Power Attic Ventilator is rated at 1400 CFM with an Energy Efficient 2.1 amp 115 volt 60 Hz PSC Motor and aluminum flange. The dome is aluminum with a weathered grey powder coat finish. It has an automatic adjustable thermostat. It works best for attics up to 2,000 square feet. It prolongs the life of composite roof shingles with lower summer attic temperatures and humidity. Ventamatic has provided the ventilation industry with an air of excellence for over 60 years. The factory is 100 percent powered by wind generated power; 95 percent of all waste products are recycled and the packaging is recycled cardboard.