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.
BEST PRACTICE
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.
NOTICE
The air openings must be sized to handle the requirements of all appliances and air movers (exhaust fans, etc.) contained in the same space using the same air supply.
Methods of Accessing Combustion Air Into A Space
Indoor Combustion Air
NOTICE
The methods listed in this section for accessing Indoor Combustion Air 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:
Fig. 1: Equipment Located in Confined Spaces; All Air from inside the building.
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