Patterson-Kelley P-K STORM ST-5000 Installation & Owner's Manual page 21

Vent Sizing for Category II / IV Operation
The vent must be sized in accordance with the
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.
™
P-K STORM Boiler Model
ST-2500, ST-3000,
ST-3500, ST-4000
ST-2500, ST-3000,
ST-3500, ST-4000
ST-2500, ST-3000,
ST-3500, ST-4000
ST-5000 & ST-6000
ST-5000 & ST-6000
Revised: December 8, 2021
Released: December 8, 2021
ASHRAE
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.
Category IV
(Sealed Combustion)
+0.01" to +0.5" W.C.
Category IV
(Exhaust Only)
+0.01" to +1.0" W.C.
 Patterson-Kelley 2021
All Rights Reserved.
P-K Storm
Technical Service 1.877.728.5351
Systems and Equipment handbook (Chapter
220 °F (gross)
220 °F (gross)
220 °F (gross)
220 °F (gross)
220 °F (gross)
2691000273 P-K Storm ST2500-ST6000
Installation and Owners Manual Rev C.docx
TM
Gas Fired Boiler
CO
2
Natural Gas
8.75%
8.75%
8.75%
8.75%
8.75%
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