Pressure Relief Vertical Mount 3510-8X8 past 12 months Individually welded 14 guage diffusion

Individually welded 14 guage diffusion bars

904 - Double Deflection Adjustable Aluminum Blade Grille For a 30" x 18" Duct Opening (front blades parallel to shortest dimension)

3/16” holes on 1/4” staggered centers Extruded aluminum frame with signature line marks Perforated material 58% free area Countersunk mounting holes for flush appearance with color matching Phillips posi- drive screws Rust resistant pre-coat with durable powder finish Soft White

Standard Features * Extruded aluminum (

3 or 4 way air patterns from face * One size fits 6" thru 16" (collar by others) * Soft White

Pressure Relief Vertical Mount 3510-8X8 past 12 months Individually welded 14 guage diffusionh3. 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