GF-135
Esteem 399 Low NOx Boiler
Chapter 2
OMM-0089_0A
Installation, Operation & Maintenance Manual
Combustion Air/Venting
Page
21
of
188
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0089_0A
MC1 06/19/14
Ph.: 800-526-0288
WARNING!
The space must be provided with ventilation combustion air
openings properly sized for all make-up air requirements (exhaust
fans, clothes dryers, etc.), which includes the total input of all
appliances located in the same space as the Esteem unit(s) using
indirect
vented air. Esteem units installed with
direct
vent air
inputs are excluded from such consideration because they receive
combustion air directly from the outside, and so additional free
area for the openings is not required.
Failure to provide properly
sized openings could result in severe personal injury, death
or property damage.
3.4 VENTILATION AND COMBUSTION AIR REQUIREMENTS -
CATEGORY IV
A Category IV appliance uses uncontaminated indoor or outdoor air (surrounding the appliance)
for combustion.
Piping uncontaminated combustion air directly from the outdoors to the appliance is
recommended. This reduces the risks associated with indoor contaminates, flammable vapors
and tight housing construction. This practice also promotes higher system efficiency.
In installations where the Esteem boiler 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 all the
equipment. Sizing of the ventilation / combustion air openings 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 chapter of the manual and titled Methods of
Supplying Combustion Air to a Space.
3.5 METHODS OF SUPPLYING COMBUSTION AIR TO A CONFINED
SPACE - CATEGORY IV
NOTE
The methods listed in this section for accessing Indoor
Combustion Air assume that the infiltration rate is adequate and
not less than .40 ACH. For infiltration rates less than .40 ACH,
reference the NFPA 54 National Fuel Gas Code for additional
guidance.
