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3.5 Flue Gas / Exhaust Venting
All vent installations shall be in accordance with NFPA 54/ANSI Z223.1, the National Fuel Gas Code, or
CAN/ CSA-B149.1, the Natural Gas and Propane Installation Code, or applicable provisions of the local
building codes.
The vent material to be used for US and Canada is listed in the Table of Acceptable Materials for
Venting Systems located in 2.5.4.
For interior clearance requirements, refer to 2.4.3.
the roof, or at least two (2) feet above the highest part of any structure within ten (10) feet of the vent.
Refer to
3.5.2
for an illustration of the flue termination. Additionally, the boiler vent shall terminate at
least three (3) feet above a forced air inlet located within ten (10) feet.
To prevent the possible re-circulation of flue gases, the vent designer must take into consideration such
things as prevailing winds, eddy zones, building configurations, etc. Patterson-Kelley cannot be
responsible for the effects such adverse conditions may have on the operation of the
appliances.
Vertical vents are allowed to be terminated with a variety of ends, including plain straight pipe, elbow, or
vent tee. Horizontal vents must be terminated with an elbow or vent tee. Similarly, a bird screen with 1"
x 1" openings is recommended for termination. Patterson-Kelley does not recommend using a vent rain
cap of any type.
Revised: February 2, 2024
Released: February 2, 2024
The vent shall extend at least three (3) feet above
Patterson-Kelley 2024
All Rights Reserved.
®
P-K Storm
Gas Fired Boiler
Technical Service 1.877.728.5351
2691000403 P-K Storm ST2500-ST8000
Installation and Owners Manual Rev G.docx
Page 31
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