Vent Termination - Patterson-Kelley P-K MACH CM300 Installation & Owner's Manual

Vent Sizing
The vent must be sized in accordance with the ASHRAE Systems and Equipment handbook, Chapter
30 or according to the vent manufacturer's recommendations. When using manufactured venting
systems, consult your vent supplier for correct sizing and structural support requirements. See the
table below table for vent design parameters.
®
P-K MACH Boiler Model
CM300, CM399, CM500,
C750, C1050
CM300, CM399, CM500,
C750, C1050
CM300, CM399, CM500,
C750, C1050

3.5.2 Vent Termination

For interior clearance requirements, refer to Section 2.5.5.
feet above the roof, or at least two (2) feet above the highest part of any structure within ten (10)
feet of the vent. This is illustrated in the diagram below. Additionally, the boiler vent shall
terminate at least 3 ft. above a forced air inlet located within 10 ft.
Revised: January 3, 2020
Released: January 3, 2020
Draft Stack Temperature
Category II
-0.01" to -0.05" W.C.
Category IV
(Sealed Combustion)
+0.01" to +0.22" W.C.
Category IV
(Exhaust Only)
+0.01" to +0.4" W.C.
 Patterson-Kelley 2020
All Rights Reserved.
P-K MACH
Technical Service 1.877.728.5351
Natural Gas
210 °F (gross)
210 °F (gross)
210 °F (gross)
The vent shall extend at least three (3)
1004905980 P-K MACH CM300-CM500&C750-C1050
Installation and Owners Manual (Rev F Jan-2020).docx
®
Gas Fired Boiler
CO CO
2 2
Propane Gas
9.0% 10.4%
9.0% 10.4%
9.0% 10.4%
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