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Clearances
If the boiler is to be installed near combustible surfaces, the minimum clearances are shown in the
illustration below. Failure to provide adequate service clearances, even with non-combustible surfaces,
may present problems during routine maintenance of the boiler.
combustible surfaces of 18" or as specified in the vent manufacturer's listed installation instructions.
The boiler must be installed in a space large in comparison to the boiler as described in the National
Fuel Gas Code, NFPA 54/ANSI Z223.1, Latest Edition.
Type of Surface
CSA Minimum Clearances to Combustibles
Required Minimum Service Clearances
Recommended Service Clearances
* "B" Clearance depends upon exhaust vent configuration.
† "C" Space required for pipes, ducts, etc. in this area above the boiler.
** 18" required on either the left or right side.
Type of Surface
CSA Minimum Clearances to Combustibles
Required Minimum Service Clearances
Recommended Service Clearances
* "B" Clearance depends upon exhaust vent configuration.
† "C" Space required for pipes, ducts, etc. in this area above the boiler.
** 18" required on either the left or right side.
*** ST-8000 ONLY
Note: Failure to provide recommended service clearances may make it difficult to perform service
on the boiler(s).
Revised: February 2, 2024
Released: February 2, 2024
ST-2500-ST-4000
A
18
24
36
ST-5000-ST-8000
A
18
24 / 36***
36 / 72***
Patterson-Kelley 2024
All Rights Reserved.
®
P-K Storm
Technical Service 1.877.728.5351
Maintain a clearance from the vent to
Dimensions (inches)
B*
C†
12
0
0**
12
0
18
24
Dimensions (inches)
B*
C†
12
0
0**
12
36
18
36
2691000403 P-K Storm ST2500-ST8000
Installation and Owners Manual Rev G.docx
Gas Fired Boiler
D
E
0**
18
0
24
6
D
E
0**
18
0
24
6
Page 7
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