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904 - Double Deflection Adjustable Aluminum Blade Grille For a 42" x 18" Duct Opening (front blades parallel to shortest dimension)
Accessory to the 90 Series
Standard Features Double deflection surface mount grille with adjustable airfoil blades Front blades parallel to longest dimension
Access door with 1-3/8" deep steel roll formed frame
Heavy gauge cold roll steel
Pressure Relief Horizontal Air Up 3520-18X14 Specialty Products 904 - Double Deflection Adjustableh3. Standard Features * 3510 Vertical mount * 3520 Horizontal mount air up * 3530 Horizontal mount air down * Designed to open with negative or positive pressures for intake or exhaust air * Felt edge blades to hold noise to a minimum * Aluminum construction * Blade to blade linkage * 1 4" pivot pins in nylon busings * Maximum size 24 x 24 * Mill finish h3. Options * Sleeve variations * Mounting flange * Adjustable counter balance to adjust various
