A leading brand in the roofing industry for off-ridge ventilation, GAF’s Master Flow® Attic Vents include a complete line of roof louvers, turbines, intake vents, electric vents, and innovative Green Machine™ solar-powered vents. From extra-wide nailing flanges and pre-drilled fastener holes to 100% factory-tested motors, contractors and property owners alike can be confident in their long-term performance and reliability.