Master Flow ERV4BL Power Roof Mount Attic Fan Ventilators, 1000 CFM, Black Brick Hammers This heater offers clean

This heater offers clean

Visual indication of proper closure

Easy DIY installation which adjusts to different floor heights

combines smart design with durable eye protection

Adjustable top screw for additional height variation

Master Flow ERV4BL Power Roof Mount Attic Fan Ventilators, 1000 CFM, Black Brick Hammers This heater offers cleanHighlights: Airflow CFM : 1000 Color : Black Net Free Area = 480 Sq. Ft. Pre wired roof mount attic vent and thermostat control Helps exhaust large amounts of hot and humid air from your attic Helps protect your roofing system and promotes your home's energy efficiency Energy efficient PSC (permanent split capacitor) Includes internal heavy duty screen which helps prevent animal infestation Energy efficient, uses up to 55% less electricity than