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Wall Plenum Installation
Step 1 - Outside Wall Plenum Half
Note: The wall plenum is not designed to carry any structural load. A load bearing header must be built above
the rough opening.
1) Prepare the rough opening. The rough opening should be lined with metal or wood. The plenum will warp if
sealed against concrete or brick.
2) Dry fit the outside plenum half into the rough opening and check the fit and level.
3) Remove the outside plenum half, flash the rough opening to ensure proper fit and level.
4) Pre-installing the exterior louver (VPAL2) as shown above is optional (See Page 18).
5) Apply sealant to the outside plenum half and insert into the rough opening to ensure a water-tight seal.
Ensure that the oustide plenum half is securely attached to the framed opening.
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