Ventilation And Combustion Air Requirements - Direct Vent; Ventilation And Combustion Air Requirements - Category Iv - Prestige Solo 110 Installation And Maintenance Manual

Combustion Air and Venting
Ventilation and Combustion Air
Requirements - Direct Vent
A Direct Vent appliance utilizes uncontamined
outdoor air (piped directly to the appliance) for
combustion)
For Direct Vent installations, involving only
the PRESTIGE, in which the minimum service
clearances are maintained as listed on page 4,
no ventilation openings are required.
For Direct Vent, zero clearance installations
involving only the PRESTIGE, the space /
enclosure must provide two openings for venti-
lation. 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
shares the space with air movers (exhaust fan,
clothes dryers, fireplaces, etc.) and other com-
bustion equipment (gas or oil) the space must
be provided with adequate air openings to pro-
vide ventilation and combustion air to the
equipment. To properly size the ventilation /
combustion air openings, the installer must
comply with the National Fuel Gas Code
NFPA 54, ANSI Z223.1 for installations in the
U.S or CSA B149.1 and B149.2 for installa-
tions in Canada.
WARNING
The space must be provided with venti-
lation / combustion air openings proper-
ly 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 PRES-
TIGE, excluding the input of a Direct
Vent Prestige which uses combustion air
directly from the outside, thus additional
f ree area for the openings is not
required. Failure to provide or properly
size the openings could result in severe
personal injury, death or s u b s t a n t i a l
property damage.
Ventilation and Combustion Air
Requirements - Category IV
A Category IV appliance utilizes uncontami-
nated indoor or outdoor air (surrounding the
appliance) for combustion.
BEST PRACTICES
In order to reduce the potential risks
associated with indoor c o n t a m i n a t e s
(listed on page 5), flammable vapors and
tight housing construction (little or no
infiltration air), it is recommended to
pipe uncontaminated combustion air
directly from the outdoors to the appli-
ance. This practice also promotes higher
system efficiency by reducing heated
indoor air from being exhausted from
the house and replaced by cold infiltra-
tion air into the house.
For installations in which the PRESTIGE shares
the space with air movers (exhaust fan, clothes
dryers, fireplaces, etc.) and other combustion
equipment (gas or oil) the space must be pro-
vided with adequate air openings to provide
ventilation and combustion air to the equipment.
To properly size the ventilation / combustion air
openings, the installer must comply with the
National Fuel Gas Code NFPA 54, ANSI Z223.1
for installations in the U.S or CSA B149.1 and
B149.2 for installations in Canada, as referenced
in this section of the manual and title Methods of
Accessing Combustion Air into a Space.
WARNING
The space must be provided with venti-
lation / combustion air openings proper-
ly 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 PRES-
TIGE. Failure to provide or properly
size the openings could result in severe
personal injury, death or s u b s t a n t i a l
property damage.
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