Friedrich VRP Series Installation & Operation Manual page 14

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 (VRPXALA/B) as shown above is optional (See Page 17).
5) Apply sealant to the outside plenuem 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.
6) Place the plenum divider (Part C) on the appropraite divider mounting tabs located on the inner perimeter of
the outside plenum half based on unit size (Compact/Standard).
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