For use in Fire Rated door applications under positive and neutral pressure Intertek testing certification in compliance to NFPA 252 (2000), UL 10C (2009), NFPA 252 (2012), CSI CODE 089000 Louvers & Vents
18 Gauge cold rolled steel frame and blades
Mitered welded corner frame construction
Reverse "Y" blades are frame supported at 1" increments, with blocked vision design
Single side mounting for non corridor exposure with fastening screws included