Combustion Air and Venting
Fig. 3: Equipment Located in Confined
Spaces; All Air from Outdoors
Through Ventilated Attic
Fig. 4: Equipment Located in Confined Spaces; All Air from Outdoors
Combination of Indoor and Outdoor Combustion Air
Indoor Openings: Where used, openings con- necting the interior spaces shall comply with the Indoor Combustion Air section on page 8.
Outdoor Opening(s) Location. Outdoor open- ing(s) shall be located in accordance with the Outdoor Combustion Air section.
Outdoor Opening(s) Size. Outdoor opening(s) shall be calculated in accordance with the fol- lowing:
-The ratio of the interior spaces shall be the available volume of all communi- cating spaces divided by the required volume.
-The outdoor size reduction factor shall be 1 minus the ratio of interior spaces.
-The minimum size of outdoor open- ing(s) calculated in accordance with the above outdoor air section multiplied by the reduction factor. The minimum dimension of air openings shall not be less than 3 in.
Vent System
The PERFORMANCE PLUS is designed to vent as a Category IV appliance, which requires a special vent system.
Category IV Venting is described as a vent system that has a positive static pressure and a flue temperature that may cause excessive condensate within the vent.
DANGER
Do not install the PERFORMANCE PLUS into a common vent with other gas appliances.. This may cause flue gas spillage or appliance malfunction, result- ing in possible severe personal injury, death or substantial property damage.
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