Use and Care Manual

9
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills or duct. You
must provide two permanent openings: one within 12 inches
of the ceiling and one within 12 inches of the oor. Connect
these items directly to the outdoors or spaces open to the
outdoors. These spaces include attics and crawl spaces.
Follow the National Fuel Gas Code NFPA 54/ANS Z223.1.
Air for Combustion and Ventilation for required size
of ventilation grills or ducts.
Ventilation Air From Inside Building
This fresh air would come from adjoining unconned space.
When ventilating to an adjoining unconned space, you must
provide two permanent openings: one within 12 inches of the
wall connecting the two spaces (see options 1 and 2,
Fig. 2). You can also remove door into adjoining room (see
option 3, Fig. 2). Follow the National Fuel Gas Code NFPA 54/
ANS Z223.1. Air for Combustion and Ventilation for required
size of ventilation grills or ducts.
IMPORTANT: Do not provide openings for inlet or
outlet air into attic if attic has a thermostat-controlled
power vent. Heated air entering the attic will activate
the power vent. Rework worksheet, adding the space of
the adjoining unconned space. The combined spaces
must have enough fresh air to supply all appliances in
both spaces.
Fig. 2 - Ventilation Air from Inside Building
Fig. 3 - Ventilation Air from Outdoors