Master Flow ERV4BL Power Roof Mount Attic Fan Ventilators, 1000 CFM, Black Brick Hammers Adjustable top screw for additional

Adjustable top screw for additional height variation

Professional quality formula for repairs in plaster walls and ceilings

Securely clamping

oil and cracking

Master Flow ERV4BL Power Roof Mount Attic Fan Ventilators, 1000 CFM, Black Brick Hammers Adjustable top screw for additionalHighlights: 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