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Arctic Installation and Operation Manual
3.3.2 Louvers, Grilles, and Screens
3.3.2.1 Louvers and Grilles:
The required size of openings for
combustion, ventilation, and dilution air shall
e based on the net free area of each opening.
Where the free area through a design of
louver, grille, or screen is know, it shall be
used in calculating the size opening required
to provide the free area specified. Where the
louver and grille design and free area are not
know, it shall be assumed that wood louvers
have a 25 percent free area, and met louvers
and grilles have 75 percent free area. Non-
motorized louvers and grilles shall be fixed in
the open position.
3.3.2.2 Screens
Minimum Screen Mesh Size:
Screens shall not be smaller than 1/4 " mesh.
3.3.2.3 Motorized Louvers:
Motorized louvers shall be interlocked with
the appliance so they are proven in the full
open position prior to main burner ignition
and during main burner operation. Means
shall be provided to prevent the main burner
from igniting should the louver fail to opening
during burner startup and to shut down the
main burner if the louver close during burner
operation.
3.3.2.4 Combustion Air Ducts
Combustion air ducts shall comply with the
following:
Ducts shall be constructed of galvanized steel
or a material having equivalent corrosion
resistance, strength and rigidity.
Thermal Solutions, 1175 Manheim Pike, Lancaster, PA 17601 Web:
Phone: 717-239-7642 Fax: 877-501-5212 Email:
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Ducts shall terminate in an unobstructed
space, allowing free movement of combustion
air to the appliances.
Ducts shall serve a single space.
Ducts shall not serve both upper and lower
combustion air openings where both such
openings are used. The separation between
ducts serving the upper and lower combustion
air openings shall be maintained to the source
of combustion air.
Ducts shall not be screened where terminating
in an attic space.
Horizontal upper combustion air ducts shall
not slope downward toward the source of
combustion air.
For informational purposes, there are several
codes that address the amount of air and/or
size of the opening(s) in walls for combustion
air.
NFPA 54, National Fuel Gas Code (ANSI
Z223.1)
ASME CSD-1, Controls and Safety Devices
for Automatically Fired Boilers
ASME Section VI, Recommended Rules for
Care and Operation of Heating Boilers
BOCA, National Mechanical Code
WARNING:
Do not locate air intakes where petroleum
distillates, CFC's, detergents, volatile
vapors or any other chemicals are present.
Severe boiler corrosion and failure will
result.
www.thermalsolutions.com
sales@thermalsolutions.com
Form: 2435
Revision: 8
Date: 9-19-2016
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