Pressure Relief Horizontal Air Up 3520-20X18 Residential Registers & Grilles 14" and 16" * Perforated

14" and 16" * Perforated face with concealed hinges * 2x2 galvaneal steel panel with seismic support hangers * Soft White Options * Field installable Bowtie Damper (BD) (sizes 6-14") * 780 OR - factory installed opposed radial damper (sizes 6"-14") * 780 FR - U

NGD - Narrow ceiling grid dimples for 9/16" T-Rails

904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 4" Duct Opening  (front blades parallel to shortest dimension)

Diffuser available in sizes 6×6 through 20×20

For evaporative coolers or central blower systems

Pressure Relief Horizontal Air Up 3520-20X18 Residential Registers & Grilles 14" and 16" * Perforatedh3. 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