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Venting and Combustion Air Installation
General Requirements - Category III
-
Installation must comply with local
requirements and with the National
Fuel Gas Code, NFPA 54/ ANSI Z223.1
for U.S. installations and CSA B149.1
or B149.2 for Canadian installations.
-
The PERFORMANCE requires a spe-
cial vent system designed for pressur-
ized venting and is rated as ANSI
Z21.13 Category III (pressurized vent
system, with flue temperature that
avoids excessive condensate within the
vent system).
-
The PERFORMANCE may be direct
vented with outside combustion air or
non-direct vented using room air.
-
The PERFORMANCE is approved for
the following vent manufacturers:
• Heat-Fab (Saf-T-Vent
®
)
• ProTech Systems (FasNSeal
®
)
• Flex-L (StaR-34)
• Z-Flex (Z-Vent III
™
)
DO NOT mix components from different
systems. The vent system could fail or
improperly seal, causing leakage of flue
products into the building
.
Category III Vent Termination - Guidelines
Locate the vent termination for direct or non-
direct vent applications using the following
guidelines:
1. The total equivalent length of the vent
should not exceed 100 feet as given in
Table 2, page 35.
2. The installer must consider the following
when determining the location of the vent
termination:
- Locate the vent termination where flue
vapors will not damage surrounding
shrubs, plants or air conditioning equip-
ment or be objectionable to the home-
owner.
-
The flue products will form a notice-
able plume as they condense in colder
air. Avoid terminating the vent in areas
where the plume could obstruct win-
dow views.
-
Prevailing winds could cause freezing
of flue condensation and a buildup of
water / ice on surrounding plants, build-
ing surfaces or combustion air inlet.
-
Avoid locations of possible accidental
contact of flue vapors with persons or
pets.
-
Avoid locations where prevailing winds
could affect the performance of the unit
or cause recirculation of the flue gases,
such as inside corners of buildings or
near adjacent buildings or vertical sur-
faces, window wells, stairwells,
alcoves, courtyards, or other recessed
areas.
-
Do not terminate the vent above any
doors or windows; flue condensate
could freeze causing ice formations.
-
Locate or guard the vent termination to
prevent possible condensate damage to
exterior finishes.
3. The vent termination and vent pipe must
not extend more than 12 inches beyond the
exterior wall. The vent termination for the
horizontal concentric snorkel kit must not
extend more than 24” beyond the exterior
wall.
4. Do not connect or terminate any other
appliance to the vent system or multiple
units into a common vent system.
Category III Termination Clearances
Maintain the following clearances to the vent
termination:
-
At least 6 feet from adjacent walls
WARNING
