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11
A
WARNING: Do not use one permanent opening
method if the equipment room is under negative
pressure conditions or the equipment is common vented
with other gas-red appliances.
Installations in Canada
A
CAUTION: All combustion air must be drawn from
the air outside of the building; the mechanical equipment
room must communicate directly with the outdoors.
Combustion and Ventilation Air
Contamination of Combustion Air