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2. Outdoor Openings to Boiler Room
a. Provide combustion and ventilation air to the
boiler room or enclosure. Follow the National
fuel Gas Code, ANSI Z223.1, or, in Canada,
Installation Code for Gas Burning Appliances
and Equipment, CGA Standard B149 Code as
well as all applicable local codes. Use one of
the following methods.
b. Natural gas and propane installation code
specifies venting systems and air supply
for appliances, air supply shall be provided
when either an appliance or a combination
of appliances has a total input exceeding
400,000 Btuh.
c. Air supply is defined as combustion air,
excess air, flue gas dilution air, primary air,
secondary air, and ventilation air. The air
supply requirements below are a summation
of Clause 8.4 specific to this boiler.
3. Air Supply Requirements for Appliances having
an input exceeding 400 MBH:
a. Ventilation Air: an opening for ventilation
air at the highest point that opens to the
outdoors shall provide Ventilation of the
space. The cross sectional area of this opening
shall be at least 10% of the area required for
combustion air, but in no case shall the cross-
sectional area be less than 10 in
b. Combustion Air: For combustion air where
the air supply is provided by natural airflow
from outdoors, in addition to the opening
for ventilation air, there shall be permanent
opening having a total cross-sectional free
area of not less than 1 in
BTU/hr. (70 mm
rated input of the boiler(s). The location of
the opening(s) shall not interfere with the
openings for ventilation air. Please refer
to the codes listed above for combustion
air openings if there are natural draft, fan
assisted or power draft assisted equipment
in the space.
Thermal Solutions, 1175 Manheim Pike, Lancaster, PA 17601 Website: www.thermalsolutions.com
Phone: 717-239-7642 Fax: 877-501-5212 Email: sales@thermalsolutions.com
2
(6500 mm
2
for each 30,000
2
for each kW) of the total
c. When an air supply duct is used to supply
combustion air, its discharge opening shall be
located where there is no possibility of cold
air affecting steam or water lines or other
temperature sensitive equipment.
4. Combustion Air Supply dampers, Louvers, and
Grilles
a. The free area of the combustion air supply
opening shall be calculated by subtracting
the blockage area of all fixed louvers, grilles
or screens from the gross area of the opening.
b. Openings in a fixed louver, grille, or screen
shall have no dimension smaller than 1/4"
(6mm).
c. No manually operated damper or manually
operated adjustable louvers are permitted.
Sources of combustion air contaminants,
including chlorines, chlorofluorocarbons
(CFC's), petroleum distillates, detergents,
volatile vapors or other chemicals must not
be present in the boiler room. If any of these
contaminants are present, severe corrosion
and failure will result.
2
).
Asphyxiation Hazard. Common manifold
venting requires special considerations. Follow
the instructions in this manual
Thermal Solutions takes no responsibility for
vent systems that create issues and or affect
the performance of the appliance.
Improper Installation of a Category II vent
system resulting in positive pressure in the
vent system can result in flue gas spillage and
carbon monoxide emissions, causing severe
personal injury or death.
WARNING
WARNING
WARNING
WARNING
33
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