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PREPARING FOR INSTALLATION
Ventilation Air From Inside Building
This fresh air would come from adjoining unconfined
space. When ventilating to an adjoining unconfined
space, you must provide two permanent openings:
one within 12 in. of the wall connecting the two spaces
(see options 1 and 2, Fig. 4). You can also remove
door into adjoining room (see option 3, Fig. 4).
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 Outdoors
Provide extra fresh air by using ventilation grills or
duct. You must provide two permanent openings: one
within 12 in. of the ceiling and one within 12 in. 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 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 unconfined space. The combined
spaces must have enough fresh air to supply all
appliances in both spaces.
VFF-L25D
Fig. 5 - Ventilation Air from Outdoors
VFF-L25D
Fig. 4 - Ventilation Air from
Inside Building
VFF-L32D
VFF-L32D
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