Order size is door cutout size
Material: 16 gauge CRS frame and louver blades. Construction: Mitered and welded corners; screws fastened through prepared frame into louver core; this mounting method leaves corridor side of frame free of fasteners for aesthetic and security purposes. Adjustable blades of 16 gauge cold rolled steel pivot on cadmium- plated steel rivets. The blades are operated by a manual trigger. A spring-loaded fusible link mechanism is incorporated into the design. Upon melting of the link, the action bar is actuated thereby closing and locking all of the blades. Louver assembly is 19/16” deep. Drilling holes in the door for installation is not required. Finish: Mineral bronze baked on powder coat. Door: For 13/4" door. Fasteners: #8 x 3/4" phillips head screws. Free Flow Area: 45% free area.