Master Flow 1000 CFM Mill Power Roof Mount Attic Fan ERV4M

The GAF Master Flow ERV4 Power Roof Vent is a great overall investment in attic ventilation. It can quickly 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 ERV4 model Power Roof Mount Vent can move air at a rate of up to 1000 cu. ft. per minute. It is designed for attic spaces up to 1600 sq. ft.