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Heavy Duty ConstructionMRI CompatibleInsect Screen
* 2550 - Round Spring actuated (6) damper for vertical or horizontal mount
For damper free area chart A click here * 2563 - Out-of-Airstream fire door
Designed for ceiling or sidewall applications
Standard Features *Surface mount return air grille * 45 fixed blades parallel to longest dimension * Countersunk mounting holes for flush appearance with color matching Phillips posi-drive screws * Soft White Options * 935 O - recessed screwdriver operated opposed blade damper * No Labor Collar (square sizes only) * 900 T - T-Bar mount * 905 HD - reinforced construction * 905 IS - insect screen * 1335-1338 Series - stainless steel version * Tamper proof screws
Pressure Relief Horizontal Air Up 3520-18X12 Smoke-Fire Damper Heavy Duty ConstructionMRI CompatibleInsect Screenh3. 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
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