Procom PCR60M Manual page 8

CAUTION: If the area in which the heater may be operated is smaller than that defined as an unconfined
space or if the building is of unusually tight construction, provide adequate combustion and ventilation air by
one of the methods described in the National Fuel Gas Code, ANSI Z./NFPA, Air for Combustion and
Ventilation or applicable local codes.
Ventilation Air From lnside 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
(see options 1 and 2, Figure 2). You can also
remove the door into adjoining room (see
option 3, Figure 2). Follow the National Fuel
Gas Code. NFPA 5/ANSI Z.. 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, NFPA 5/ANSI Z.. 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 2 - Ventilation Air from Inside Building
Figure 3 - Ventilation Air from Outdoors