Patterson-Kelley P-K STORM ST-1250 Installation & Owner's Manual page 38

™
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: October 2, 2019
Released: October 2, 2019
Acceptable termination fittings:
•
Downward elbow
•
Horizontal tee
•
Velocity cone
(1" x 1" bird screen recommended)
Minimum
clearance:
12" from sidewall
 Patterson-Kelley 2019
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
2691000099 P-K Storm Installation and Owners
Manual.docx
Page 29