fig. 24).
Fig. 24
Part nr. 2ZVBP03 for 3" venting
Part nr. 2ZVBP04 for 4" venting
Installation
For this solution to be effective, the internal flapper must be
100% closed when the water heater is not running. Refer to
Figures 25 and 26 for preferred installation positions in the
vent system.
If using the Zflex damper:
•
Ensure directional arrow on damper label faces in the same
direction as exhaust flow.
•
If installed horizontally, the axis must be horizontal or
slightly pitched up towards termination to ensure damper
closes 100% when heater is not running.
•
To allow accessibility, damper must not be installed in an
enclosed section of vent pipe.
•
Do not install damper in unconditioned spaces (e.g. attics)
Condensation can build up while the heater is running
which can later freeze and potentially block the flapper
940 ES – 6 720 644 930 (2019/09)
6720608542-08.1V
Fig. 25
[1] Good
[2] Better
[3] Best
Combustion air piping not shown for clarity purposes
Installation instructions
29