Patterson-Kelley P-K STORM ST-1250 Installation & Owner's Manual page 37

™
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:
•
+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)
 Patterson-Kelley 2019
All Rights Reserved.
Technical Service 1.877.728.5351
STORM
Sidewall (exhaust only)
Minimum
exhaust
clearance:
12" from
sidewall
2691000099 P-K Storm Installation and Owners
P-K Storm TM Gas Fired Boiler
™
Category II/IV:
Manual.docx
Page 28