Installation manual
FIGURE 17 - Concentric
Adapter, Outdoor
Combustion Air Pipe,
and Concentric Vent
Pipe
FIGURE 18 - Outside
View of Combustion Air
Pipe with Box Attached
to Under Side of Roof
7.2.3 VERTICAL VENT
TERMINAL Installation -
Option CC2 (cont’d)
7.2 Venting and
Combustion Air
(cont’d)
7.0 Mechanical
(cont’d)
6. Determine the length and install the “terminal end” vent pipe.
6a) Refer to FIGURE 17 and determine the required length of the continuous sec-
tion of vent pipe. The length of the vent pipe extending through the box, through
the combustion air inlet pipe, and the height required above the combustion air
inlet air pipe must be one piece of pipe without joints.
Determine the length by adding the requirements:
Starting with at least 6” (152mm) below the box for attaching to the coupler;
plus 6” (152mm) through the concentric adapter box;
plus the length of the combustion air pipe;
plus a minimum of 23” (584mm) beyond the top of the combustion air pipe.
Total is the minimum length of the vent pipe section.
NOTE: A longer vent pipe may be required; see FIGURE 17.
6b) Install the “terminal end” vent pipe.
Being sure the pipe is in the proper ow direction, slide the end into the box and
out through the combustion air pipe. Position the pipe so that it extends beyond
the combustion air pipe the height determined in 6a) above. Verify that the silicone
ring is seated properly.
Join the terminal vent pipe to the vent pipe run. Re-check the silicone ring to be
sure that it is still properly seated.
Form I-UEAS, Page 24