Page 12 / IM 178
Assembly instructions
1. Set curbing parts A through H per dimensions shown over
roof opening or on a level surface. Note location of return
and supply air openings.
2. If applicable, set other curbing parts (D, L, M, etc.) in place
making sure that the orientation agrees with the assembly
instructions. Check alignment of all mating bolt holes. See
Detail “A”.
3. Bolt curbing parts together using fasteners provided.
Tighten all bolts finger tight.
4. Square entire curbing assembly and securely tighten all
bolts.
5. Position curb assembly over roof openings. Curb must be
level from side to side and over its length. Check that top
surface of the curb is flat with no bowing or sagging.
6. Weld curbing in place. Caulk all seams watertight. Remove
backing from 0.25" (6 mm) thick x 1.50" (38 mm) wide
gasketing and apply to surfaces shown by crosshatching.
7. Flash curbing into roof as shown in Detail “B”.
8. Parts E and F are not required on units with no return shaft
within the curb perimeter.
9. Parts G and H are not required on units with no supply
shaft within the curb perimeter.
38.8
(984)
7.5
(191)
2
(51)
“X”
Inside
“YY”
1.5
(38)
76 (1930)
Inside
6.8
(173)
20
(508)
Inside
85
(2159)
“Y”
Inside
“XX”
62.8
(1594)
See Detail “A”
Supply
Air
Return
Air
Figure 5b. RDS roof curb assembly instructions
Main unit curb
➀
Unit base
➁
Curb gasketing
➂
2 x 4 nailer strip
√
Galvanized curb
➄
Cant strip
(not furnished)
≈
Roofing material
(not furnished)
∆
Rigid insulation
not furnished)
➇
Counterflashing
(not furnished)
➈
Flashing
(not furnished)
Equal Length
Side Supports
Detail “A”
Using remaining side supports in this area,
align lengths on opposite sides of assembly
and install a cross support “D” at each splice.
RETURN
“X”
“Y”
“XX”
“YY”
FAN
IN.
MM
IN.
MM
IN.
MM
IN.
MM
NONE
24.0
610
82.0
2083
6.8
173
1.5
38
(2) 15" FC
24.0
610
82.0
2083
6.8
173
1.5
38
30" AF
30.0
762
76.0
1930
6.8
173
4.5
114
40" AF
36.0
914
78.0
1981
14.8
376
3.5
89
Figure 5a. RDS roof curb assembly instructions
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