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.