Pressure Relief Horizontal Air Up 3520-18X12 Smoke-Fire Damper * 2550 - Round Spring

* 2550 - Round Spring actuated (6) damper for vertical or horizontal mount

Round Bowtie Damper

Sleeve Submittal

Options * MAR - Mounting Angle Ring (sold in pairs - 2 needed

Opposed Blade Damper standard on 4" widths

Pressure Relief Horizontal Air Up 3520-18X12 Smoke-Fire Damper * 2550 - Round Springh3. 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