PageSoundHeaderCurbs

Model AT Sound Curbs are designed to reduce fan generated sound traveling down the ductwork without adversely affecting fan performance. Air passes between the streamlined baffles allowing the fan sound to be absorbed and dissipated within the curb area preventing it from entering the building.

Each perforated aluminum baffle section is filled with fiberglass wool. Spring steel wire holding clips secure the aluminum baffle. The assembly is a rigid, durable section which will not warp or twist out of shape. The permanently constructed baffles

are easy to remove for access to dampers or for occasional cleaning. No tools are required. Slight pressure is required to spread the spring wire to release it.

Model ATS

This curb is designed for use on flat, non-insulated roof decks. It is mounted directly to the roof with a 11⁄8‑inch flashing flange then flashed to the top of the wood nailer for weather tightness. This style is recommended when height is not objectionable and where smaller roof openings are desired. Model ATS consists of welded seams and canted construction which is fully insulated with rigid fiberglass board.

Model ATR

This roof curb is designed for use on flat, insulated roof decks. It is mounted directly to the deck structure with a 11⁄8‑inch flashing flange, then roofed and flashed to the top of the wood nailer for weather tightness. The curb body is recessed into the roof in order to achieve a lower overall height. Roof openings must be as large as the curb body. Model ATR consists of continuous welded seams and canted construction which is fully insulated with rigid fiberglass board.

Model ATI, ATIP and ATIR

These curbs are designed for roof decks and consist of continuous welded seams. Model ATI for use on flat, non-insulated roofs, ATIP for pitched roofs and ATIR for ridge (double pitched) roofs. They are mounted directly to the roof deck with a 2‑inch flashing flange before the

insulation is applied, then roofed and flashed to the top of the wood nailer for weather tightness.

Model ATE

Sound attenuating curb extensions are designed to reduce fan generated sound traveling down the ductwork. Model ATE is an extension to be mounted between the fan and the roof curb. It is available in heights of 18 to 24 inches.

Special Purpose Roof Curbs

Model H-GPF— This roof curb is specifically designed for high wind applications up to 150 mph, used on fan models H-G, H‑GB, H-CUE, and H-CUBE. Standard height is 12 inches, fully welded straight sides with a 5‑inch flashing flange. See CAPS for required installation details.

Model GPSHL — This prefabricated roof curb is specifically designed for heavy weight fans, such as the model LSF and Greenheck’s Lab Exhaust units. GPSHL is available in 16 gauge galvanized steel and 0.080 aluminum construction. Included are curb side reinforcement angles approximately every 12 inches. Available heights include 8 and 12 inches only.

Model SD and SDP — The severe duty curbs are specifically designed for high wind applications up to

150 mph and used on models LDP, LBP, RSFP, H-G, H-GB, H-CUE, H-CUBE, and USGF fans. Model SD is for use on flat roofs and model SDP for pitched roofs. They are attached directly to the building structure with extremely high structural design load requirements. Maximum design load is 140 psf. The severe duty curbs are 12 gauge coated steel with a 13⁄4‑inch lip on the top and a 4 inch flange on the bottom. Available heights include 12, 18 and 24 inches only. Heights greater than 18 inches are reinforced in the interior with 12 gauge x 2‑inch angles.