Pressure Relief Vertical Mount 3510-16X18 T-Bar 904 - Double Deflection Adjustable

904 - Double Deflection Adjustable Aluminum Blade Grille For a 42" x 18" Duct Opening (front blades parallel to shortest dimension)

PERFORMANCE DATA 915 Series Engineering/Performance Data

Hinged removable face with hinges parallel to longest side

904 - Double Deflection Adjustable Aluminum Blade Grille For a 24" x 4" Duct Opening  (front blades parallel to shortest dimension)

Dampers above 80 square inches free area will be provided with blade insulation

Pressure Relief Vertical Mount 3510-16X18 T-Bar 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