Lomanco LomanCool 909 Adjustable Louver, 211 to 439 sq-in Net Free Ventilating Area, Aluminum, Mill, Roof Installation

The Lomanco Series 900 adjustable louversfit roof pitches of 2-1/2/12 to 9/12. The ingenious design actually forces the louver blades to pivot, changing angle as the unit is adjusted. This permits maximum air flow capacity while assuring optimum protection