Pressure Relief Horizontal Air Up 3520-24X12 Residential Registers & Grilles 1/2" spacing dual angular louvers

1/2" spacing dual angular louvers for strength and maximum free area

inner dimension and outer dimension sizes available * Tamper proof screws * Standard Color

Stamped steel face with roll formed frame

Minimum size is 4"x4"

060 T6 extruded aluminum construction * 45 fixed blade face to conceal filter * Hand operated lever for easy filter access * Concealed mounting holes * Filter door hinges parallel to longest side * Filter retainers * Removable face for easy cleaning * For 1" filter (not included) * Soft White Options * 900 2 FG - 2" filter spacing (filter not included) * 900 TFG - T-Bar mount * 920 FG Series - galvaneal steel frame * Standard Color

Pressure Relief Horizontal Air Up 3520-24X12 Residential Registers & Grilles 1/2" spacing dual angular louversh3. 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