The GAF Master Flow ERV6 Power Roof Vent is a great overall investment in attic ventilation. It can efficiently remove a larger volume of hot and/or humid air from your attic when compared to static ventilation. This in turn can help save money on your heating and cooling costs. The ERV6 model Power Roof Mount Vent can move air at a rate of up to 1500 cu. ft. per minute. It is designed for attic spaces up to 2800 sq. ft.. Heavy-duty internal screen helps prevent animal infestation. Galvanized steel construction for durability. Miami-Dade County Product Control approved, State of Florida approved, and meets or exceeds the requirements of Texas Department of Insurance. Energy efficient uses up to 55% less electricity than typical competitor's vents (based on GAF testing at 120-Volt). UL Listed. Optional humidistat available (H1) - sold separately. Excellent for roof slopes 3:12 to 12:12. Helps to reduce energy costs and helps prolong life of the roof and shingles