Patterson-Kelley P-K STORM ST-8000 Installation And Owner's Manual page 134

Exhaust Venting

The P-K STORM
operating with slightly negative to slightly positive exhaust pressure. It is critical to ensure the
flue venting material is suitable for use with the boiler.
®
P-K STORM Boiler Model
ST-2500, ST-3000, ST-3500,
ST-4000
ST-5000, ST-6000, ST-8000
ST-2500, ST-3000, ST-3500,
ST-4000
ST-5000, ST-6000, ST-8000
If the combustion air intake ductwork and the exhaust vent terminate on the same wall of the
NOTE:
building, they must utilize the same type of termination fitting.
Patterson-Kelley recommends including a motorized combustion air damper in each
NOTE:
appliance's air intake ductwork. Refer to
NOTE: ST-2500-ST-4000: Total combined vent pressure not to exceed 0.44" W.C.
ST-5000-ST-8000: Total combined vent pressure not to exceed 1.0" W.C.
Revised: February 2, 2024
Released: February 2, 2024
boilers are dual-certified as Category II & Category IV appliances, capable of
Flue Vent Category
II
II
IV
IV
3.4.3
 Patterson-Kelley 2024
All Rights Reserved.
Technical Service 1.877.728.5351
Maximum Allowable
Pressure Drop
through Combustion
Air Ductwork
0.22" W.C.
0.5" W.C.
0.22" W.C.
0.5" W.C.
below for more information.
Installation and Owners Manual Rev G.docx
®
P-K Storm Gas Fired Boiler
Allowable Vent Pressure
-0.01" W.C. to
-0.05" W.C.
-0.01" W.C. to
-0.05" W.C.
+0.01" W.C to +0.44" W.C.
+0.01" W.C to +1.0" W.C.
2691000403 P-K Storm ST2500-ST8000
Page 123