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2" ADC compliant round collar with a bead for ease of installation
904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 24" Duct Opening (front blades parallel to shortest dimension)
Standard Features Double deflection surface mount grille with adjustable airfoil blades Front blades parallel to longest dimension
Extruded aluminum frame with steel roll formed blades and steel multi-shutter damper
Heavy gauge cold roll steel
Parallel Volume Damper Low Leak 3000PLL-64X28 Residential Registers & Grilles 2" ADC compliant round collarh3. 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
