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10
Combustion Air and Venting
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-
l o w i n g :
- 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.
Do not install the PERFORMANCE
PLUS into a common vent with other g a s
appliances.. This may cause flue gas
spillage or appliance malfunction, re s u l t-
ing in possible severe personal injury,
death or substantial pro p e r ty damage.
DANGER
Equipment Located in Confined
Spaces; All Air from Outdoors
Through Ventilated Attic
Fig. 3:
Equipment Located in Confined
Spaces; All Air from Outdoors
Fig. 4: