Ventilation And Combustion Air Requirements - Direct Vent; Ventilation And Combustion Air Requirements - Category Iv - TriangleTube PRESTIGE Excellence 110 Installation & Maintenance Manual

CHAPTER 2 - COMBUSTION AIR & VENTING
2.2. Ventilation and Combustion Air Require-
ments - Direct Vent
A Direct Vent appliance utilizes uncontaminated out-
door air piped directly to the appliance for combustion.
For Direct Vent installations involving only the PRESTIGE
Excellence, in which the minimum service clearances
are maintained as listed in Section 1.5 on page 2, no
ventilation openings are required, but may be neces-
sary to equalize the air pressure with the outside.
For Direct Vent installations involving only the PRESTIGE
Excellence, in which the minimum service clearanc-
es are not maintained as listed in Section 1.5 on page
2, the space / enclosure must provide two openings
for ventilation. The openings must be sized to provide
1 square inch of free area per 1,000 BTUH of boiler input.
The openings shall be placed 12 inches from the top
of the space and 12 inches from the floor of the space.
For installations in which the PRESTIGE Excellence shares
the space with air movers (exhaust fan, clothes dryers,
fireplaces, etc.) and other combustion equipment (gas
or oil) the space must be provided with adequate air
openings to provide ventilation and combustion air to
the equipment. To properly size the ventilation / com-
bustion air openings, the installer must comply with the
National Fuel Gas Code (NFPA 54 / ANSI Z223.1) for in-
stallations in the U.S. or CAN/CSA B149.1 for installations
in Canada.
WARNING
The space must be provided with ventilation
/ combustion air openings properly sized for
all make-up air requirements (exhaust fans,
clothes dryers, fireplaces, etc.) and the total
input of all appliances located in the same
space as the PRESTIGE Excellence, exclud-
ing the input of a Direct Vent PRESTIGE Ex-
cellence which uses combustion air directly
from the outside, thus additional free area
for the openings is not required. Failure to
provide or properly size the openings can re-
sult in substantial property damage, serious
injury, or death.
4
2.3. Ventilation and Combustion Air Require-
ments - Category IV
A Category IV appliance utilizes uncontaminated indoor
or outdoor air surrounding the appliance for combus-
tion.
BEST PRACTICE
In order to reduce the potential risks associated
with indoor contaminates (see list in Section
2.1 on page 3), flammable vapors and tight
housing construction with little or no infiltration
air, it is recommended to pipe uncontaminated
combustion air directly from the outdoors to
the appliance. This practice also promotes high-
er system efficiency by reducing heated indoor
air from being exhausted from the house and
replaced by cold infiltration air into the house.
For installations in which the PRESTIGE Excellence shares
the space with air movers (exhaust fan, clothes dryers,
fireplaces, etc.) and other combustion equipment (gas
or oil) the space must be provided with adequate air
openings to provide ventilation and combustion air to
the equipment. To properly size the ventilation / com-
bustion air openings, the installer must comply with
the National Fuel Gas Code (NFPA 54 / ANSI Z223.1) for
installations in the U.S. or CAN/ CSA B149.1 for installa-
tions in Canada.
WARNING
The space must be provided with ventilation
/ combustion air openings properly sized for
all make-up air requirements (exhaust fans,
clothes dryers, fireplaces, etc.) and the total
input of all appliances, including the PRES-
TIGE Excellence when located in the same
space. Failure to provide or properly size the
openings can result in substantial property
damage, serious injury, or death.