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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 2.5.5.
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. Harsco Industrial, 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. Harsco Industrial, Patterson-Kelley does not recommend
using a vent rain cap of any type.
Category II or IV Venting Installation
®
P-K SONIC
boilers are dual certified as Category II or IV appliances, as defined in ANSI Z21.13/CSA
4.9, latest edition and are not suit able for use with Type "B" Vents.
and Canada is listed in the Table of Acceptable Materials for Venting Systems located in 2.5.4.
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.
N
: For Category II installations, ensure the flue venting system is designed to maintain a
OTE
slightly negative exhaust pressure between -0.01" W.C. and -0.05" W.C.
N
: For Category IV installations, ensure the flue venting system is designed to maintain a
OTE
slightly positive exhaust pressure which MUST BE in the following ranges:
+0.01" W.C. and +0.22" W.C. (Direct Vent / Sealed Combustion)
+0.01" W.C. and +0.4" W.C. (Exhaust Only)
Revised: June 2, 2017
Released: June 2, 2017
HARSCO Industrial, Patterson-Kelley 2017
All Rights Reserved.
Technical Service 1.877.728.5351
The vent shall extend at least three (3) feet above
The vent material to be used for US
1004905978 P-K SONIC NURO Installation and
®
P-K SONIC
Gas Fired Boiler
Owners Manual (Rev F Jun-2017).docx
Page 27
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