Form I-RDF, P/N 148384 (Rev 1), Page 7
FIGURE 4 - Cross Support
Mounting Requirements
Field
Supplied
Duct
Field
Supplied
Duct
4 x 4 Treated Lumber
= support location
FIGURE 5 - Dimensions
of Optional Roof Curb
(Option CJ3) - Shipped
Separately
CAUTION: Before installing curb, recheck to be sure that the
correct curb has been ordered. Be sure that the curb selected
matches the unit ordered. Verify the dimensions of the curb
received with the dimension table in FIGURE 5.
Mounting on a
Roof Curb
IMPORTANT NOTE:
Area enclosed by roof curb
must comply with clearance
to combustible materials. If
the roof is constructed of
combustible materials, area
within the roof curb must be
ventilated, left open, or
covered with non-combus-
tible material which has an
"R" value of at least 5. If
area within curb is left
open, higher radiated sound
levels may result.
B
A
C
D
1-7/8
(48)
1-7/8 (48)
1-7/8
(48)
Roof Curb
Ductwork for
Bottom Discharge
(Option AQ1
or AQ3)
Roof Curb Ductwork for
Optional Return
Air
Airflow
(See IMPORTANT
NOTE on the left.)
Roof Curb
Dimensions for
Model RDF Series 3
Whether the roof curb is Option CJ3 designed for the system or a field-sup-
plied curb, the roof curb dimensions in FIGURE 5 and the ductwork opening
dimensions in FIGURE 7 apply.
The roof curb designed for the system includes dividers that will create internal
ductwork and duct connection flanges for ease of installation and so that the
building ductwork can be attached before the system is set on the roof curb.
NOTE: Drawing is
not proportional for
all sizes.
Sizes
inches
mm
inches
mm
inches
mm
A
84-5/8
2149
84-5/8
2149
131-3/4
3346
B
43-5/8 1108
67-9/16
1716
82-1/16
2084
C
80-7/8 2054
80-7/8
2054
128
3251
D
39-7/8 1013
63-13/16
1621
78-5/16
1989
Height
Weight
Roof Curb Dimensions (± 1/8" or 3mm) and Approximate Weights
171 lbs (78 kg)
224 lbs (102 kg)
307 lbs (139 kg)
1-20-3, 1-40-3, 1-50-3, 1-65-3
2-80-3, 2-120-3
3-180-3, 3-260-3
16 inches (406 mm)
