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United States Minimum Area of Ventilation Openings per Boiler (Sq. In)
STORM Boiler
MODEL
ST-2500
ST-3000
ST-3500
ST-4000
ST-5000
ST-6000
ST-8000
1. The required size of openings for combustion and ventilation air shall be based on the net
free area of the opening.
2. Screens shall not be smaller than 1/4 inch.
3. Motorized louvers shall be interlocked with the appliance so that they are proven open prior to
main burner ignition and operation.
Air Inlet Requirements - Canada
Air inlet requirements for the Canadian Provinces are established by CAN/CSA B149.1.
the space occupied by fuel burning appliance(s) or equipment shall be supplied by a ventilation opening
at the highest practicable point communicating with the outdoors. The total cross sectional area of the
ventilation opening must be either 10% of the net free area required for combustion air or 10 sq. in.
(6,500 mm
), whichever is greater.
2
A. Ventilation of the space occupied by fuel burning appliance(s) or equipment shall be supplied by
a ventilation opening at the highest practicable point communicating with the outdoors. The
total cross sectional area of the ventilation opening must be either 10% of the net free area
required for combustion air or 10 sq. in. (6,500 mm
B.
Use the following opening calculation for
When combustion air is supplied for a forced draft burner by natural airflow from the
outdoors and there is no draft regulator or draft hood in the same space, there shall be a
permanent opening with a cross sectional area not less than 1 sq. in/30,000 Btu/Hr (70
2
mm
/kW) of the total rated input to the burner(s). This opening must not interfere with the
ventilation air opening defined in Paragraph A.
C. When combustion air is supplied by natural airflow into a space containing the type of appliance
described in Paragraph B, the cross sectional area of the opening shall not be less than the
sum of the cross sectional areas for all appliances in the space as calculated by the applicable
method. This opening is in addition to the ventilation air opening defined in Paragraph A.
D. When a duct is used to meet the requirement for combustion air supply, as described in
Paragraphs A through C, above, the opening of the duct shall be located so there is no
possibility of cold air affecting steam or water piping, electrical equipment or mechanical
equipment.
E. When combustion air is supplied by mechanical means, an airflow-sensing device must be
installed. It must be wired into the pre-ignition limit/interlock to prevent the burner from starting
or to stop an operating burner in case of air supply failure.
Revised: February 2, 2024
Released: February 2, 2024
INDOOR AIR SUPPLY
SAME
DIFF
FLOOR
FLOORS
2500
5000
3000
6000
3500
7000
4000
8000
5000
10000
6000
12000
8000
16000
NOTES:
P-K STORM
Patterson-Kelley 2024
All Rights Reserved.
P-K Storm
Technical Service 1.877.728.5351
AIR SOURCE
OUTDOOR AIR SUPPLY
TWO OPENINGS
ONE
OPENING
DIRECT
833
625
1000
750
1167
875
1334
1000
1668
1250
2002
1500
2670
2000
2
), whichever is greater.
boilers:
2691000403 P-K Storm ST2500-ST8000
Installation and Owners Manual Rev G.docx
®
Gas Fired Boiler
VERT
HORIZ
DUCT
DUCT
625
1250
750
1500
875
1750
1000
2000
1250
2500
1500
3000
2000
4000
Ventilation of
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