P-K Storm
TM
Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: June 26, 2020
Released: June 26, 2020
©
Patterson-Kelley 2020
All Rights Reserved.
2691000273 P-K Storm ST2500-ST4000
Installation and Owners Manual Rev A.docx
Page 5
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.
Maintain a clearance from the vent to
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
Dimensions (inches)
A
B*
C†
D
E
CSA Minimum Clearances to Combustibles
18
12
0
0**
0**
Required Minimum Service Clearances
24
12
0
18
0
Recommended Service Clearances
36
18
24
24
6
* “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.
Note:
Failure to provide recommended service clearances may make it difficult to perform service
on the boiler(s).
