Burnham Apex APX399, Installation, Operating And Service Instructions

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Figure 2: Clearances To Combustible and non-combustible Material
iii. Pre-installation and Boiler Mounting
G. General (continued)
Boiler Clearances to Combustible (and Non-
Combustible) Material:
APX399 and APX500 Boiler Models:
These boilers are approved for closet installation with
the following clearances – Top = 1”, Front = 1”, Left
Side = 10”, Right Side = 2”, Rear = *6”
APX800 Boiler Model:
This boiler is approved for alcove installation with the
following clearances – Top = 1”, Front = Open, Left
Side = 10”, Right Side = 2”, Rear = *6”
*
Note:
When boiler is vented vertically, the minimum
clearance from the rear of the jacket is increased
to 18” with a short radius 90° elbow provided in
order to provide adequate space at boiler rear for
installation of vent and air intake piping and service
access
Boiler Service Clearances – Applicable to all Boiler
Models:
Top = 24”, Front = 24”, Left Side = 24”, Right Side =
24”, Rear = 24”
The above Clearances are recommended for Service
Access but may be reduced to the Combustible Material
Clearances provided:
1. The boiler front is accessible thru a door
2. Access is provided to the condensate trap located on
the left side of boiler
3. Access is provided to thermal link located at the
boiler rear
approved Direct
Vent System
Vent Pipe
Material
Vent
Pipe
Direction
Enclosure
Vent Pipe
nominal
Diameter
Minimum
Clearance to
Combustible
Material
Factory Standard
Two-Pipe CPVC/PVC Vent and PVC
Air Intake
* CPVC/PVC
Vertical or
Horizontal
Unenclosed at
all Sides
4” or 6” 1”
Available Optional
Two-Pipe Rigid Polypropylene Vent
(or, Flexible Polypropylene Liner
for Vertical Venting only) and Rigid
Polypropylene or PVC Combustion
Air Intake
Pipe Rigid
Polypropylene
Vent (or,
Flexible
Polypropylene
Liner for
Vertical
Venting only)
80 mm
10 mm
(110 mm)
150 mm
(160 mm)
1”
Available Optional
Two-Pipe Stainless Steel Vent and
Galvanized Steel or Air Intake
Stainless
Steel
4” or 6” 1”
available Optional
Concentric Inner Polypropylene Vent
and Outer Steel Air Intake
Polypropylene
100/150 mm
(110/160 mm)
0”
*
Do not enclose PVC venting - use CPVC vent pipe in enclosed spaces, or to penetrate through
combustible or non-combustible walls