Ceco fire rated 24in x 24in louvre

Ceco Fire-Rated Door Louvre 1900A2424G, Adjustable Z Blade, Self-Attach, 24in x 24in, Gray Primer - $644.00 delivered
Adjustable Z-Blade Louver with Fusible Link activated at 165 Degrees F is Ideal for Use in Fire Doors up to 1-1/2 Hour Rating. The Self-Attaching Frame Style is Ideal for Installation in Existing Door Cutouts.
16 gauge CRS frame and louver blades. 
Z blade louver is riveted to the operating bar and frame at 1in intervals to welded 1 9/16in deep frame. Mechanical Stop holds blades open.
Mitred and welded corners with screws fastened through prepared frame into louver core leaving corridor side of frame free of fasteners.
Adjustable blades of 16ga. CRS pivot on cadmium-plated steel rivets.
The blades are operated by a manual adjusting lever.
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.
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