Installation Manual

4 BX-SVN-JAYCURB001-1A-EN
Installer's Guide
Roof Mounting Curb and Supply/Return Size Required Air Opening
Important: The opening must be covered temporarily to
prevent anyone or anything from falling thru the opening.
Follow this safety precaution when working in other
areas of installation, and leaving the job site overnight
for any extended period of time.
1. All duct work must be installed in accordance with
the National Fire Protection Association Standards
No. 90A and 90B.
2. Remove only that portion of the roof deck to permit
the installation of field fabricated air ducts.
Roof decking remaining beneath unit base pan will
reduce sweating on bottom of unit base pan during
high humidity conditions.
3. All components are used to assemble roof curb. See
Figure 4 for components of curb.
SERVICE CLEARANCE DIMENSIONS
A B C D
12” 18” 24” 48”
Figure 2. Required Clearance for unit Installation and Roof Penetration
Hole Size Required for Full Perimeter Curb
ROOF
OPENING
CHANNEL SIDE
WOOD NAILER
SUPPLY
RETURN
A
B
C
D
20”
38 1/4”
CHANNEL
END
Figure 3. Full Perimeter Roof Mounting Curb Outline
40 1/4”
53 1/4”
51 1/4”
38 1/4”
14”
18 5/8”
15 5/8”
7”
15 5/8”