Pressure Relief Vertical Mount 3510-12X16 T-Bar 3 cone steel diffuser with

3 cone steel diffuser with hinged core for easy duct access

945 Series Engineering/Performance Data

Standard Features * T-Bar lay-in filter grille with steel removable perforated face * 3/16" holes on 1/4" staggered centers * 20" x 20" x 1" filter (not included) * Square collar for 20 x 20 duct * 2x2 galvaneal steel panel with seismic support holes * Soft White Options * Square to round No Labor Collar

SD52 - Transition Box Spiral Pipe Grille (Single Deflection)

For evaporative coolers or central blower systems

Pressure Relief Vertical Mount 3510-12X16 T-Bar 3 cone steel diffuser withh3. 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