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AIR FOR COMBUSTION AND VENTILATION Cont.
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills or ducts. You must provide two permanent openings: one within 12” of the
ceiling and one within 12” of the floor. Connect these items directly to the outdoors or spaces open to the outdoors. These
spaces include attics and crawl spaces.
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.
FIGURE 6 - Ventilation Air from Outdoors
Vertical Venting in Cold Climates
In cold climate conditions where temperatures go below -10 degrees Celsius or 14
degrees Fahrenheit, we recommend that the chase be insulated and where the vent
pipe enters into the attic space that the pipe be wrapped with an insulated mylar
sleeve. This will increase the temperature of the vent and help the appliance to
vent properly in cold weather conditions.
It is also important in vertical vented direct vent appliances that the appliance be
operated daily during the winter months as this will help stop the Termination
from freezing up. We recommend using a thermostat set at room temperature to
allow the unit to cycle.
Summary of Contents for FVF300
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