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WARNING:
If the area in which the heater may be operated does not meet the required volume for
indoor combustion air, combustion and ventilation air shall be provided by one of the methods
described in the
National Fuel Gas Code,
ANSI Z223.1/NFPA 54, the
International Fuel Gas Code,
or
applicable local codes.
Ventilation Air from Inside Building
This fresh air would come from an adjoining unconfined space. When ventilating to an adjoining
unconfined space, you must provide two permanent openings: one within 12 inches of the ceiling and one
within 12 inches of the floor on the wall connecting the two spaces (Figure 3). You can also remove the
door into adjoining room (see option 3, Figure 3). Follow the National Fuel Gas Code. ANSI Z223.1/NFPA
54, Air for Combustion and Ventilation for required size of ventilation grills or ducts.
Ventilation Air from Outdoors
Provide extra fresh air by using ventilation grills or ducts. You must provide two permanent openings: one
within 12 inches of the ceiling and one within 12 inches of the floor. 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, ANSI Z223.1/ NFPA 54, 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 unconfined space. The combined spaces must have
enough fresh air to supply all appliances in both spaces.
Figure 3 - Ventilation Air from Inside Building
NOTE: Base not included. Not for use in bedrooms or bathrooms.
Figure 4 - Ventilation Air from Outdoors
