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2
Step 1
Measure, cut and frame out the wall plenum
opening
• Measure and mark on the inside of the external
closet wall the plenum cutout dimensions as
shown below.
IMPORTANT: The wall plenum is not designed to
carry structural loads. A proper header opening
must be built into the rough opening. The plenum
requires flashing, shim and caulk for a weather-
resistant installation.
NOTE: It is the responsibility of the installer to
properly install the plenum and meet building
code requirements.
20”
32¼”
Inside closet,
looking out through
wall plenum rough cutout
External
wall
Step 2
Install the plenum
1. Before caulking and permanent attachment,
place the plenum into the cutout hole and check
for fit and level.
2. Insert the plenum into the cutout opening with
1/4” minimum protruding from the external wall.
Side view
Outside
1/4” min.
(continued on next page)
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