19
Installation
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Specifications
Factory-supplied roof curbs shall be constructed of 16 gauge G-90 galvanized steel and fully assembled at the factory. A 1.5” wood nailer
shall be provided around the entire perimeter of the curb. Curb shall be fully insulated through 1.5” fiberglass insulation. Cross-member
supports shall be provided for connecting ductwork prior to the unit being set on the roof.
Duct Connections to Curb
When the supply air discharge opening and/or the return air intake opening are located on the bottom of a unit, the ductwork must be
connected to the curb directly. The actual opening sizes in the floor of the unit are not specified as they are slightly undersized from the duct
dimensions shown on the following curb drawings.
Curb and Ductwork Dimensions
—
AR-DR Models (11-XX, 21-XX, and 31-XX Chassis)
Only AR-DR 11-XX chassis have two cross members (Dimension B; see dimensional drawing below). The supply air ductwork on AR-DR 21-
XX and AR-DR 31-XX chassis is mounted directly to the exterior rail of the curb.
INSTALLATION
Installation Location
Figure 7:
Curb and Ductwork Dimensions Diagram for AR-DR Models 11-XX, 21-XX, 31-XX Chassis.
Table 5:
Curb and Ductwork Dimensions Table for AR-DR Models 11-XX, 21-XX, 31-XX Chassis.
Chassis
A
B
C
D
E
F
G
H
AR-DR-11-XX
42.5 in.
7.13 in.
28.25 in.
20.63 in.
22 in.
43.25 in.
17.38 in.
104.75 in.
AR-DR-21-XX
54.75 in.
1.5 in.
51.75 in.
23.75 in.
22 in.
43.13 in.
24.38 in.
114.75 in.
AR-DR-31-XX
61.5 in.
1.5 in.
58.5 in.
20.75 in.
26 in.
50.5 in.
26 in.
124.75 in.
