Air Distribution · Plenums
Return air plenum box
Plenum box assembly — Ceiling/wall
ConnectionRectangular/round return connection
SupportIndependent support
How to install it
- 1
Install box
- 2
connect return duct
- 3
seal
- 4
mount grille
- 5
keep filter/access path clear.
Quality check
- No bypass, grille removable, box supported
Stop and verify
Stop if return opening or filter area is too small