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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
2
), whichever is greater.
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.
F. When all combustion air is supplied through a make-up air heater, and the appliance is
interlocked to the heater, the requirements of Paragraphs A through E do not apply.
Canadian Minimum Area of Combustion and Ventilation Air Openings
™
P-K STORM
ST-2500
ST-3000
ST-3500
ST-4000
ST-5000
ST-6000
Revised: December 8, 2021
Released: December 8, 2021
NOTES:
BTU/Hr
Model #
Input
2,500,000
3,000,000
3,500,000
4,000,000
4,999,999
6,000,000
Patterson-Kelley 2021
All Rights Reserved.
Technical Service 1.877.728.5351
2
), whichever is greater.
P-K STORM
boilers:
Required Combustion
Air Opening
2
2
in
mm
83
53,548
100
64,516
117
75,484
134
86,451
167
107,742
200
129,032
TM
P-K Storm
Gas Fired Boiler
Ventilation of
Ventilation Air
Opening
2
2
in
mm
10
6,452
10
6,452
13.4
8,645
13.4
8,645
16.7
10,774
16.7
10,774
2691000273 P-K Storm ST2500-ST6000
Installation and Owners Manual Rev C.docx
Page 26
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