Air Distribution Systems; Roof Jack Selection - Nordyne M1GH 056 Installation Instructions And Owner's Manuals

6" (152 mm)
Top Clearance
0" Side
Clearance
to Furnace
Cabinet
Figure 2. Alcove Installation
6" (152 mm)
Top Clearance
0" Side
Clearance
to Furnace
Cabinet
Figure 3. Closet Installation
6" (152 mm)
Top Clearance
0" Side
Clearance
to Furnace
Cabinet
Figure 4. Special 1" Clearance
6
Provide removable
access panel above
furnace door frame to
access roof jack
Nearest
Wall or
Partition
Provide min. 235
sq. in. (1516 cm ) 2
open free area in
front or side wall
or
In closet
door
located
at top,
center
or bottom
CLOSET DOOR
Provide min. 250
sq. in. (1613 cm )
2
open free area in
front or side wall
A fully
louvered
door may
be used
CLOSET DOOR
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.
!
CAUTION:
HAZARD OF ASPHYXIATION: Do not cover or
restrict return air opening.
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
Dual trunk duct
B
w/crossover connector
Transition duct
w/branches
C
Figure 5. Typical Supply Duct System