GE Telescopic Wall Plenum (for wall thicknesses 5" to 9") in Black

Telescopic design
An integral part of the installation, the universal plenum design can accommodate a range of different wall thickness (5" to 9")
Quick Install 2-piece Plenum
Two-piece design that allows assembling the plenum before installing in the wall by measuring the wall thickness to determine the right depth and reduces overall installation time
Easy interior installation
Plenum is easily installed from the interior of building. No need for exterior handling (*only caulking needs to be applied from exterior)
Positive gasket seal
A 1.25" thick gasket assures a complete seal between the plenum and unit eliminating outdoor air or moisture from entering the space