Patterson-Kelley STORM ST-2500 Installation & Owner's Manual page 39

™
STORM Category II/IV:
Through-the-roof (exhaust only)
Motorized
combustion air
damper
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:
•
+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 26, 2020
Released: June 26, 2020
Acceptable termination fittings:
•
Downward elbow
•
Horizontal tee
•
Velocity cone
(1" x 1" bird screen recommended)
Minimum
clearance:
12" from sidewall
© Patterson-Kelley 2020
All Rights Reserved.
TM
P-K Storm Gas Fired Boiler
Technical Service 1.877.728.5351
™
STORM Category II/IV:
Sidewall (exhaust only)
Minimum flue
vent clearance:
36" above air
intake
Motorized
combustion air
damper
2691000273 P-K Storm ST2500-ST4000
Installation and Owners Manual Rev A.docx
Page 30