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Ships within 48 hours · Estimated delivery Aug 8 - Aug 13
Available in 6”–12” collar sizes
SD34 - Transition Box Spiral Pipe Grille (DOUBle Deflection)
Front blades parallel to shortest dimension
Allows for 4-way airflow
Pressure Relief HD 3530-20X12 Specialty Products Available in 6”–12” collar sizesh3. 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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