Pressure Relief HD 3530-14X18 Smoke-Fire Damper T-Bar Modular Core Diffuser with

T-Bar Modular Core Diffuser with Round Collar 18-20

Double deflection transition box mount spiral pipe grille

CB30 - three way

Standard Features * Lightweight Aluminum vent louver * This is a larger version of the 4901 series * Flush face * Spring clip mounting * Able to withstand wet and corrosive environments * Easily installed using only a high grade silicon caulk * Satin Anodized finish Options * IS - Insect screen * Standard Color or Designer Color Finish available on this product

Pressure Relief HD 3530-14X18 Smoke-Fire Damper T-Bar Modular Core 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