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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 24" 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
Clearance to Non-Combustible Surfaces
Recommended Service Clearances
* "B" Clearance depends upon exhaust vent configuration.
† "C" Space required for pipes, ducts, etc. in this area above the boiler.
** Do not put pipes, ducts, vents, etc. in this space. Electrical conduit must be installed vertically so that
the side doors can be
Note: Failure to provide recommended service clearances may make it difficult to perform service
on the boiler(s).
Revised: June 2, 2017
Released: June 2, 2017
opened.
HARSCO Industrial, Patterson-Kelley 2017
All Rights Reserved.
P-K SONIC
Technical Service 1.877.728.5351
Maintain a clearance from the vent to
Dimensions (inches)
C†
A
B
18
6*
12†
0
0
32
12*
12†
1004905978 P-K SONIC NURO Installation and
Owners Manual (Rev F Jun-2017).docx
®
Gas Fired Boiler
D
6**
0
0
12**
Page 5
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