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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 1
1
⁄
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 1
1
⁄
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.
Sound Curbs
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 1
3
⁄
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.
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