About the 12X20 Horizontal Mount Air Up Pressure Relief Damper (Aluminum) - Shoemaker 3520
This 12"x20" Shoemaker Horizontal Mount Air Up Pressure Relief Damper (Aluminum) 3520 Series is designed to open in upward flowing airstreams with negative or positive pressures for intake or exhaust air. It is built with an all-aluminum construction. It features blade-to-blade linkage. Its blades are parallel to the first dimension given. It is available in single blades on dampers 10 inches high or less. Dampers with multiple blades feature adjustable counter balance arms mounted to the center of the blades, with adjustable weights that can be positioned along the length of the arm for different opening pressures. It comes equipped with ¼ inch pivot pins in nylon bearings and foam blade edges to reduce noise. It is available from a minimal size of 6"x6" and a maximum size of 24"x24". This pressure relief damper comes with a mill finish. This Shoemaker 3520 is designed to fit and cover a 12" wide by 20" high opening. The quality and functionality of this damper are only two of the many reasons why Shoemaker Manufacturing leads the field in innovative design for real world applications. The Shoemaker 3520 Series has a complete line of products designed for homes, offices, stores, and many other commercial applications. Unlike other products, Shoemaker products have a baked-on textured polyester powder coat that can resist scratches and does not wear or fade out easily. Please measure the hole opening size instead of measuring the face plate of your old grille. Please note that this damper is designed to fit over a 12"x20" existing hole or duct. Refer to the Specification Sheet for more information.
