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For damper free area chart B click here * 2565 - Round fire door for vertical mount only
Louvers designed with rolled rib for maximum strength and rigidity
PERFORMANCE DATA FGAD Series Engineering/Performance Data
916 Series Engineering/Performance Data
For damper free area chart B click here * 2665 - Round fire door for vertical mount only
Pressure Relief Horizontal Air Up 3520-12X18 Step Down Ceiling Diffuser For damper free area charth3. 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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