Double Deck J4PG4 Installation Manual

* The above figures for reference purpose only.
Fig. 3-6 Roof Curb Dimension
17
For units applied with a roof curb, the minimum clearance may be
reduced from 1 inch to 1/2 inch between combustible roof curb
material and this supply air duct.
* The above figure for reference purpose only.
3.7Roof Curb
In applications using roof curbs,the unit must be placed on
the curb so that the front of the unit is tightly close to curb.
(See Fig.2-10 ROOF CURB DIMENSION)
Fig 3-8
Table 3-2
Supply and return air (including duct
support rails) shown are typicalfor bottom
duct applications.For location of horizontal
duct applications (on back of unit),refer to
unit dimension details.
1
1"
Insulation layer
A-A
B
A
A
SUPPLY
AIR
RETURN
AIR
1"
1"
E
F
D
C
C
A-A
B
A
A
SUPPLY
AIR
RETURN
AIR
1"
D
CC
1"
LARGE CURB
SMALL CURB
"B" in.[mm] "C" in.[mm] "D" in.[mm] "E" in.[mm] "F" in.[mm]
14-1/4 [362] 15-1/4 [387] 46-1/16 [1170] 16 [406] 42-3/16 [1070]
14-1/4 [362] 14 [356] 46-1/16 [1170] 16 [406] 30-5/8 [778]
SMALL
Dimensions(Inches)
CURB
LARGE