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Canadian Minimum Area of Combustion and Ventilation Air Openings
®
P-K MACH
Model #
C-1500H
C-2000H
C-2500
C-3000
C-4000
®
3.4.3 P-K MACH
Combustion Air Requirements
The table below summarizes the combustion air requirements for P-K MACH
®
P-K MACH
Model #
C-1500
C-2000
C-2500
C-3000
C-4000
3.4.4 Direct Vent / Sealed Combustion Installations
®
The P-K MACH
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.
The combustion air supply must be free from dust, lint, etc. The presence of such materials in the air
supplied to the burner could cause nuisance "Low Air" shutdowns or premature burner failure. The
appliance should not be operated during construction while the possibility of drywall dust, demolition
dust, etc. exists.
The combustion air supply must be completely free of chemical fumes which may be corrosive when
burned in the appliance. Common chemicals which must be avoided are fluorocarbons and other
halogenated compounds, most commonly present as refrigerants or solvents, such as Freon
trichloroethylene, perchloroethylene, chlorine, etc. These chemicals, when burned, cause improper
combustion and premature appliance failure due to the formation of acids which quickly attack the heat
exchanger and the flue piping materials.
Revised: January 3, 2020
Released: January 3, 2020
Required Combustion
BTU/Hr
Air Opening
2
Input
in
1,500,000
50
2,000,000
67
2,500,000
83
3,000,000
100
4,000,000
134
Air Intake Connection
10"
10"
12"
12"
12"
Patterson-Kelley 2020
All Rights Reserved.
®
P-K MACH
Technical Service 1.877.728.5351
Ventilation Air
Opening
2
2
mm
in
32,258
10
43,226
10
53,548
10
64,516
10
86,451
13.4
®
boilers:
Required SCFM Combustion Air
350
470
580
696
928
1004905981 P-K MACH C1500H-C4000 Installation and
Owners Manual (Rev F Jan-2020).docx
Gas Fired Boiler
2
mm
6,452
6,452
6,452
6,452
8,645
®
,
Page 28
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