Parallel Volume Damper Low Leak 3000PLL-50X50 Smoke-Fire Damper Margin edges are 7/8" projection

Margin edges are 7/8" projection for baseboard installation

Ceiling opening must be 4” larger in length and width than the nominal duct size

Square or rectangular for vertical mount only

904 - Double Deflection Adjustable Aluminum Blade Grille for a 16" x 8" Duct Opening   (front blades parallel to shortest dimension)

Parallel Volume Damper Low Leak 3000PLL-50X50 Smoke-Fire Damper Margin edges are 7/8" projectionh3. Standard Features * 16 gauge galvanized channel frame * Parallel blades are cee stiffened 16 gauge galvanized for strength and stability * Blades pivot on non metallic celcon bushings * 1 2" square zinc plated steel pivot pins * 1 2" square zinc plated steel adjustable operating shaft extending up to 4" beyond the air control frame * Single blades on dampers with a height of 12" or less * Mill finish h3. Options * 3000 PLL Low Leak Air Control