The GAF Master Flow EGV5 Gable Mount Attic Ventilators are a great choice for exhaust ventilation. They are typically easier to install and won't detract from the appearance of your roof. They can quickly remove a larger volume of hot and/or humid air from your attic, compared to static ventilation, which helps save money on your heating and cooling costs. The EGV5, Power Gable Mount Vent can move air at a rate of up to 1450 cu. ft. per minute. For attic spaces up to 2300 sq. ft.. Optional humidistat available (H1) - sold separately. Galvanized steel construction for durability. Mounting brackets included for installation. Mounts in the gable inside the attic. Helps to reduce energy costs and helps prolong life of the roof and shingles