Typical Installation and
Anchoring
Concrete Deck Anchoring
USGF
Size
Fan Curb Cap
Roof Opening
Fasteners Per Side
Outside Flange
141 - 161
22 x 22
(559 x 559)
181/2 x 181/2
(470 x 470)
5
31 x 31
(787 x 787)
180 - 200
30 x 30
(762 x 762)
201/2 x 201/2
(521 x 521)
7
39 x 39
(991 x 991)
All dimensions in inches (millimeters).
Corner Detail
11/4 in.
(32 mm)
11/4 in.
(32 mm)
Minimum Concrete
Strength of 2000 PSI
1 in.
(25 mm)
Insulation
Roof Opening
5 in.
(127 mm)
Mounting Flange
Outside Flange
Center fasteners
on flange
Use 3/8 in.
(10 mm)
expansion anchor
or equal into concrete.
Fasteners one on each corner as
detailed.
Each side at center of unit. Maximum
fastener spacing of 8 in.
(203 mm)
,
add additional fasteners to satisfy.
Minimum 1-3/4 in.
(44 mm)
edge distance
2-1/2 in.
(64 mm)
Embedment Recommended
minimum 1-5/8 in.
(41 mm)
CONCRETE DECK ANCHORING DETAIL
H-GPF Curb Height
8 to 18 in.
(203 to 457 mm)
(Optional 24 in.
(610 mm)
SD Curb)
Outside of Roof Curb
1 in.
(25 mm)
less than Fan Curb Cap
Typical Mounting - Fan to Curb
USGF
Size
Fasteners
Per Side
Total
Fasteners
140 - 160
5
20
180 - 200
5
20
Fasteners on each side of the
fan are to be installed with one
fastener 4 in.
(102 mm)
from each
edge and one fastener centered.
The remaining fasteners are to be
equally spaced.
1/4 in.
(6 mm)
fastener minimum
5/16 in.
(8 mm)
recommended
See table for fastener quantities
FAN TO CURB MOUNTING DETAIL
H-GPF or SD curb
Fastener 4 in.
(102 mm)
from curb edge
