4
Air Handling Unit
Installation, Operation, and Maintenance Manual
April 2021
Figure 3-2.
Note: The warranty does not cover damage to the unit
or controls during storage.
4.0 Roof Curb Installation
ClimateCraft ships roof curbs unassembled for assembly
at the job site. Assembly instructions are provided
by the curb manufacturer and attached to each curb
package. Each part is clearly identified with proper tags
and markings. It is critical curbs and/or structural steel is
level, flat, square and plumb. Curbs and structural steel
must be out-of-level no more than 1/64” per foot and no
more than 1/8” over the entire air handling unit.
Curb gasket must be placed between the curb and
the air handling unit. Curb gasket provides an air seal
between the unit and the curb. A sealant may be used in
place of the curb gasket if desired.
Your ClimateCraft air handling unit will fit over the roof
curb and rest on the curb angle within the perimeter of
the unit base as shown in Figure 4-1. The overall outside
roof curb dimensions are 6” less than the air handling
unit base frame dimensions.
Figure 4-1.
2 x 4
NAILER
CURB
GASKET
CURB
CURB HEIGHT
CURB WIDTH/LENGTH = UNIT FRAME WIDTH/LENGTH LESS 6"
3.0"
3.0"
UNIT FRAME WIDTH/LENGTH
Figure 4-2. Suggested Roof Curb Installations
CURB GASKET
2 X 4 NAILER
ROOF CURB
CURB
INSULATION
ROOF
STRUCTURE
ROOF DECKING
ROOF
INSULATION
CANT STRIPS
ROOFING FELT
