The FLX-MOV plenum box is used for mounting supply-exhaust grilles
in the residential ventilation system with a heat recovery unit.
The plenum box has on the one end male duct connection spigot for
FLX-HDPE ducts, and on the other end it has a slot adapted to SHR grilles.
In addition, the height (length) of the plenum box is adjustable in the range
of 200-310, which allows you to match the plenum box size to the partition thickness.
