Sealed Combustion/Direct Vent Systems - Patterson-Kelley P-K STORM ST-8000 Installation And Owner's Manual

Sealed Combustion/Direct Vent Systems

These boilers are also certified for operation with a sealed combustion air and pressurized venting
system. Such a system employs a sealed combustion air intake duct leading from outdoors and a sealed
exhaust vent terminating outdoors. Air flow through the system is maintained by the combustion air fan.
Allowable configurations of vent and air intake terminations are illustrated below.
The exhaust vent must be at least 3 feet above the air intake. The air intake and exhaust vent must
extend 12" from the exterior wall and be offset. The inlet air duct loss should not exceed 0.22" W.C.
The combined pressure drop of the air supply duct and exhaust vent must not exceed 0.44" W.C. (1.0"
for ST-5000, ST-6000, & ST-8000). This pressure drop includes both the inlet and exhaust duct friction
loss. The air inlet and the exhaust vent must terminate on the same wall of the building and they must
utilize fittings as shown below. This boiler may be installed with sidewall vent using room air.
Revised: February 2, 2024
Released: February 2, 2024
NOTE
(.5" for ST-5000, ST-6000, & ST-8000)
36"
Minimum
12" Minimum
 Patterson-Kelley 2024
All Rights Reserved.
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P-K Storm Gas Fired Boiler
Technical Service 1.877.728.5351
Exhaust
Vent
Air Inlet
2691000403 P-K Storm ST2500-ST8000
Installation and Owners Manual Rev G.docx
Page 36