035-14370-000
650.75-N4U
Unitary Products Group
17
NOTE:Combustion air and vent pipes must terminate
together in the same atmospheric zone, either through a roof
or sidewall.
When selecting the location for combustion air/vent termina-
tion the following should be considered:
1.
Comply with all clearance requirements as listed below.
2.
Termination should be positioned where vent vapors will
not damage plants or shrubs or air conditioning equip-
ment.
3.
Termination should be located where it will not be
affected by wind gusts, light snow, airborne leaves or
allow recirculation of flue gases.
4.
Termination should be located where it will not be dam-
aged or exposed to flying stones, balls, etc.
5.
Termination should be positioned where vent vapors are
not objectionable.
VENT CLEARANCES (2-PIPE) U.S. ONLY
Dryer Vent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 ft.
Plumbing Vent Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 ft.
Gas Appliance Vent Terminal . . . . . . . . . . . . . . . . . . . 3 ft.*
From any mechanical fresh air intake . . . . . . . . . . . . . . 1 ft.
From any door, window or non-mechanical fresh air or
combustion air intake . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ft.
Above grade and anticipated snow depth . . . . . . . . . . . 1 ft.
Above grade when adjacent to public walkway. . . . . . . 7 ft.
From electric, gas meters, regulators and relief equipment -
min. horizontal distance . . . . . . . . . . . . . . . . . . . . . . . . 4 ft.
* Does not apply to multiple installations of this furnace
model. Refer to “VENTING MULTIPLE
UNITS" Section on page 17 .
NOTE:Consideration must be given for degradation of build-
ing materials by flue gases.
NOTE:Shaded components of the combustion air/vent sys-
tem shown in the following figures are considered to be part
of the vent terminal. These components should not be
counted when determining piping limitations. Refer to Figure
17 to Figure 22.
Sidewall termination may require sealing or
shielding of building surfaces with a corrosive resistance
material to protect against combustion product corrosion.
VENTING MULTIPLE UNITS
Each unit must have its own intake/vent piping and termina-
tion. Do not use common pipes for combustion air or venting.
The vent terminals must be located as shown in Figure 21
and FIGURE 22.
NOTE:Accessory concentric intake/vent terminations,
models 1CT0302 and 1CT0303 are available and
approved for use with these furnaces. Refer to Form
650.75-N2.4V for installation details.
In Canada, refer to CAN/CGA-B149.1 or.2 Installation
Code (latest edition - Venting Systems and Air Supply)
FIGURE 17 : HORIZONTAL TERMINATION CON-
FIGURATION WITH 12” MINIMUM
CLEARANCE
FIGURE 18 : HORIZONTAL TERMINATION RAISED
CONFIGURATION FOR ADDITIONAL
CLEARANCE
VENT
OVERHANG
COMBUSTION AIR
12" SEPARATION BETWEEN
BOTTOM OF COMBUSTION AIR
AND BOTTOM OF VENT
MAINTAIN 12" CLEARANCE ABOVE
HIGHEST ANTICIPATED SNOW LEVEL
OR GRADE, WHICHEVER IS GREATER
12" MINIMUM
90°
VENT
OVERHANG
COMBUSTION AIR
(ELBOW PARALLEL TO WALL)
12" SEPARATION BETWEEN
BOTTOM OF COMBUSTION AIR
AND BOTTOM OF VENT
MAINTAIN 12" CLEARANCE ABOVE
HIGHEST ANTICIPATED SNOW LEVEL
OR GRADE, WHICHEVER IS GREATER
12" MINIMUM
90°
