6
Provide removable
access panel above
furnace door frame to
access roof jack
Nearest
Wall or
Partition
18"
(457 mm)
6" (152 mm)
Top Clearance
0" Side
Clearance
to Furnace
Cabinet
6" (152 mm)
Top Clearance
0" Side
Clearance
to Furnace
Cabinet
Provide min. 235
sq. in. (1516 cm )
open free area in
front or side wall
2
or
In closet
door
located
at top,
center
or bottom
CLOSET DOOR
6" (152 mm)
Top Clearance
Provide min. 250
sq. in. (1613 cm )
open free area in
front or side wall
2
A fully
louvered
door may
be used
CLOSET DOOR
6"
(152 mm)
1"
(25 mm)
0" Side
Clearance
to Furnace
Cabinet
Figure 2. Alcove Installation
Figure 3. Closet Installation
Figure 4. Special 1" Clearance
j.
For floor return systems, the manufactured home
manufacturer shall affix a prominent marking on or
near the appliance where it can be easily read when
the closet door is open. The marking shall read:
k. Air conditioning systems may require more duct,
register and open louver area to obtain necessary
airflow. Use NORDYNE’s certiduct program to
determine proper duct size for A/C.
8. AIR DISTRIBUTION SYSTEMS
For proper air distribution, the supply duct system must be
designed so that the static pressure measured external to the
furnace does not exceed the listed static pressure rating
shown on the furnace rating plate.
Three typical distribution systems are illustrated in Figure 5.
Figure 5. Typical Supply Duct System
Location, size, and number of registers should be selected
on the basis of best air distribution and floor plan of the home.
9. ROOF JACK SELECTION
Note: Install only Roof Jack Assemblies listed in Table 5 on
this heating appliance.
a. Determine depth of ceiling cavity from center of roof
opening to center of ceiling opening. (See Dimension
“A” in Figure 6.)
b. Determine ceiling height and subtract height of furnace.
(See Dimension “B” in Figure 6.)
c. Add dimensions A + B (and X from Table 6 and Figure
7 if slant deck flashing is used). The total length of (A
+ B + X) must be within the minimum and maximum
range of one of the Roof Jacks listed in Table 5.
A Single trunk duct
B
Dual trunk duct
w/crossover connector
C
Transition duct
w/branches
CAUTION:
HAZARD OF ASPHYXIATION: Do not cover or
restrict return air opening.
!
