Patterson-Kelley P-K STORM ST-5000 Installation & Owner's Manual page 46

™
STORM Category II/IV:
Through-the-roof (exhaust only)
Minimum flue vent clearance:
36" above nearby parapet
wall
12" above expected snowline
Loop/trap for condensate or rain
water disposal (pipe to drain)
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:

ST-2500 – ST-4000: +0.01" W.C. and +0.22" W.C. (Direct Vent / Sealed
Combustion)

ST-2500 – ST-4000: +0.01" W.C. and +0.4" W.C. (Exhaust Only)

ST-5000: +0.01" W.C. and +0.5" W.C. (Direct Vent / Sealed Combustion)

ST-5000: +0.01" W.C. and +1.0" W.C. (Exhaust Only)
Revised: December 8, 2021
Released: December 8, 2021
Acceptable termination fittings:

Downward elbow

Horizontal tee

Velocity cone
(1" x 1" bird screen recommended)
Minimum
exhaust
clearance:
12" from
sidewall
 Patterson-Kelley 2021
All Rights Reserved.
TM
P-K Storm Gas Fired Boiler
Technical Service 1.877.728.5351
™
STORM Category II/IV:
Sidewall (exhaust only)
2691000273 P-K Storm ST2500-ST6000
Installation and Owners Manual Rev C.docx
Page 35