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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
1.
The free area of a combustion air supply opening is calculated by deducting the blockage area
of any fixed louvers, grilles or screens from the total area of the opening.
2. Screens shall be not 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.
P-K STORM
®
ST-2500
ST-3000
ST-3500
ST-4000
ST-5000
ST-6000
ST-8000
®
P-K STORM
The table below summarizes the combustion air requirements for P-K STORM
®
P-K STORM
Model #
ST-2500
ST-3000
ST-3500
ST-4000
ST-5000
ST-6000
ST-8000
Direct Vent / Sealed Combustion Installations
The P-K Storm
®
series boilers are certified for operation in direct vent / sealed combustion systems,
which feature combustion air intake ductwork which sources the combustion air supply from outdoors.
The flow of combustion air through this ductwork is maintained by the appliance's combustion blower.
The combustion air intake ductwork can be constructed with PVC, CPVC, single wall galvanized steel,
or other suitable materials. The ductwork must be rigid enough to maintain the full required cross
sectional area under all operating conditions.
NOTE: The combustion air intake ductwork must be sufficiently rigid in order to prevent collapse
due to the potential for negative pressures inside the ductwork. If the ductwork collapses, this will
restrict the combustion air supply to the appliance which may prohibit operation.
Proper sealing of the combustion air intake ductwork is necessary to prevent infiltration of air from
conditioned space. For example, joints in PVC or CPVC piping must be cemented. For galvanized
duct, wrap each joint and seam with adhesive aluminum tape or other sealant. Patterson-Kelley
recommends installing a 1" x 1" or larger bird screen on the exterior termination. Ensure that the screen
does not become blocked with snow, ice, insects etc.
Revised: February 2, 2024
Released: February 2, 2024
BTU/Hr
Model #
Input
2,500,000
3,000,000
3,500,000
4,000,000
4,999,999
6,000,000
8,000,000
Combustion Air Requirements
Air Intake Connection
Patterson-Kelley 2024
All Rights Reserved.
NOTES
Required Combustion
Air Opening
in
2
mm
2
83
53,548
100
64,516
117
75,484
134
86,451
167
107,742
200
129,032
266
171,613
Required SCFM Combustion Air
12"
12"
12"
12"
16"
16"
16"
®
P-K Storm
Gas Fired Boiler
Technical Service 1.877.728.5351
Ventilation Air
Opening
in
2
mm
2
10
6,452
10
6,452
13.4
8,645
13.4
8,645
16.7
10,774
16.7
10,774
16.7
10,774
®
boilers:
580
696
812
928
1160
1392
1856
2691000403 P-K Storm ST2500-ST8000
Installation and Owners Manual Rev G.docx
Page 27
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