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* UL and California State Fire Marshall approved * 4-1/4" standard frame style * Maximum dimension 60w
Adjustable blades oriented for 3 or 4-way air flow pattern
904 - Double Deflection Adjustable Aluminum Blade Grille For a 18" x 4" Duct Opening (front blades parallel to shortest dimension)
Hinged removable face with hinges parallel to longest side
Parallel Volume Damper Low Leak 3000PLL-70X20 Accessories * UL and California Stateh3. 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
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