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By Air Louvers
Adjustable Z-Blade Louver with Fusible Link activated at 165 Degrees F is Ideal for Use in Steel and Composite Fire Doors up to 1-1/2 Hour Rating. The Self-Attaching Frame Style is Ideal for Installation in Existing Door Cutouts.Louver: Z-blade louver is riveted to the operating bar and frame at 1'' intervals to welded 1-9/16'' deep frame. Mechanical Stop holds blades open.. Frame: Mitered and welded corners: screws fastened through prepared frame into louver core leaving corridor side of frame