70 Venting for Combustion Air
* IPEX and Centrotherm Low Profile terminations
only
** Clearance above highest anticipated snow level
or grade, or as required by local codes, whichever
is greater
Note
Only the following orientations are
allowed for twin pipe terminations.
●
Flexible Vent Systems (Polypropylene)
Note
●
Only VERTICAL installations are
allowed. Horizontal terminations are
prohibited.
●
The use of proper adapters and
supports are required to fully
complete the installation.
●
Concentric Sidewall Venting
1" (25 mm) min.
Combustion Air
Combustion Air
Maintain 12" (300 mm) min. clearance above highest
anticipated snow level or grade, whichever is greater
Vent
Vent
●
Concentric Vertical Venting
Combustion Air
Maintain 12” (300mm) min.
clearance above highest
anticipated snow level or
grade, whichever is greater
(maximum of 24” above
roof)
Vent
Note
For cascade applications, the required
horizontal clearance between
terminations is 12” for both sidewall and
vertical venting installations.
Do not vertically stack
concentric terminations
on sidewalls.
Indoor Boiler Installation Venting
Examples (Continued)
●
Low Profile Two-Pipe Sidewall Venting*
Exhaust
(from
appliance)
Intake Air
(from outdoors)
12”
(300 mm) min.**
Exterior View
Summary of Contents for NCB-190/060H
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