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8
Combustion Air and Venting
Combustion Air Requirements
The PERFORMANCE PLUS can use inside
air if no contaminants are present in the area of
installation. If contaminants are likely to be
present in the area of installation, outside air
must be piped directly to the unit as referenced
in Section VI Venting and Combustion Air
Piping.
In order to avoid the potential of indoor
contaminates when venting the appli-
ance, it is recommended to pipe combus-
tion air directly from the outdoors to the
unit as referenced in Section VI Venting
and Combustion Air Piping.
Outside Combustion Air
Combustion air can be ducted directly from the
outside to the air inlet fitting of the PERFOR-
MANCE PLUS using the following materials:
- PVC
- Galvanized metal vent
- Flexible metal vent
All seams and joints must be sealed with
sealant or mechanical fasteners. Do not use
tape as it is not considered a sealing material.
Air Openings
Air openings to the PERFORMANCE PLUS
are always required even if the combustion air is
obtained indoors or outdoors. These air open-
ings provide ventilation to prevent overheating
of the PERFORMANCE PLUS and its control
as well as providing combustion air.
The air openings must be sized to handle
the re q u i rements of all appliances and air
movers (exhaust fans, etc.) contained in
the same space using the same air s u p p l y.
Methods of Accessing Combustion A i r Into A
S p a c e
Indoor Combustion Air
The methods listed in this section for
accessing Indoor Combustion A i r
assume that the infiltration rate is ade-
quate and not less than .40 ACH. For
infiltration rates less than .40 ACH, ref-
erence the NFPA 54 National Fuel Gas
Code for additional guidance.
Opening Size and Location
Openings used to connect indoor spaces shall
be sized and located in accordance with the
following, see Fig.1:
NOTICE
NOTICE
BEST PRACTICE
Equipment Located in Confined
Spaces; All Air from inside the
building.
Fig. 1: