129098-UIM-G-0411
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Johnson Controls Unitary Products
INTERIOR EXTENSIONS
To choose the proper length roof jack with or without the optional exten-
sion see Figure 25 and Table 8. More than one interior extension may
be used to accommodate A “dimensions up to 110” (284.5 cm).
NOTE:
Use of an interior extension will increase the roof jack adjust-
able heights by the amount of the interior extension height. If the fur-
nace is installed on an elevated plenum, the plenum height must be
added to the roof jack height.
Models 4000B8161 and 4000B8181 have removable crowns.
If using an optional interior extension, place extension down on furnace
top and mate with furnace flue and combustion air collar until it lines up
with screw holes in combustion air collar. Secure the extension to the
furnace using the pre-punched holes. Use 1/2” (1.27 cm) blunt or sharp
end sheet metal screws to fasten roof jack combustion air pipe to fur-
nace combustion air collar. Screw holes are provided in pipe and collar.
Excessively long screws may extend to flue pipe and puncture. it. If
substitute screws are used. they must not exceed 1 1/2” (3.8a cm) in
length. Pull the roof jack flue and combustion air pipe assembly down
and mate with extension flue and combustion air pipes until the screw
holes line up. See Figure 25. Fasten interior extension to combustion
air pipe assembly with sheet metal screws not exceeding 1 1/2” (3.8
cm) in length.
Secure the roof jack to the roof with screws. Non-hardening mastic
sealer or caulking compound must be used to seal the roof flange to
prevent water leakage. The roof jack swivel joint must also be sealed to
prevent water leakage.
INSTALLING CEILING RING
The ceiling ring is to meet fire stop requirements. Accessory Ceiling
Ring may be used (See Figure 26) or the mobile home or modular
home manufacturer or the installer may use other approved methods to
fire stop. If required, three sections of the Accessory ring may be used
as in Figure 26 to provide closer clearance around the roof jack.
NOTE:
A portion of the outer edge of the ceiling ring may be trimmed so
the ring will fit between the warm air plenum and roof jack.
VENT CLEARANCES
FIGURE 25:
Roof Jack Assembly
The joint where the optional interior extension connects to the roof
jack must be below the ceiling. Failure to observe this requirement
may result in asphyxiation, fire, or explosion
Do not exceed the maximum adjustable height as listed in Table 6.
These maximum heights allow an additional 1 1/2” (3.81 cm) travel
before the flue pipe assembly is fully extended against the built-in
stop. This provides an additional safeguard against the flue assem-
bly being pulled from the roof jack if upward movement should
occur when the home is being transported or subjected to other
stress conditions. Failure to follow these instructions may result in
fire, explosion, or asphyxiation.
TABLE 6:
Roof Jack Options
Roof Jack
Model Number
Adjustable Height with
no Interior Extension
Adjustable Height with
on 17” Interior Extension
4000B7141
14” to 78”
64” to 95”
4000B7151
66” to 90”
83” to 107”
4000B8161
59” to 79”
76” to 96”
4000B8181
73” to 103”
90” to 110”
CEILING
COMBUSTION
AIR PIPE AND
FLUE ASSEMBLY
THIS JOINT
MUST BE
BELOW CEILING
INTERIOR
EXTENSION
(OPTIONAL)
FURNACE COMBUSTION
AIR COLLAR
Use 1/2” (1.27 cm) blunt or sharp end sheet metal screws to fasten
roof jack combustion air pipe to furnace combustion air collar Screw
holes are provided in pipe and collar. Excessively long screws may
extend to flue pipe and puncture it. If substitute screws are used,
they must not exceed 1 1/2” (3.81 cm) in length. It is mandatory that
the combustion air and flue tube assembly be properly engaged,
and the combustion air pipe fastened to the furnace with sheet
metal screws in the holes provided.
Under no circumstances shall the connection between the flue and
combustion air pipe assembly of the roof jack and the interior exten-
sion be above the ceiling line.
FIGURE 26:
Ceiling Rings
The vent must be installed with the minimum clearances as shown
in Figure 27, and must comply with local, state, regional codes and
requirements.
A
B
