FLX-PRO plenum boxes fit the FLX-HDPE and FLX-HDPE-A ducts
in diameter 63mm to help to build an air distribution ductwork
in mechanical ventilation systems (including heat recovery unit).
The low profile plenum boxes require less installation space than standard
solutions, which is very convenient when they should not be prominent once concealed.
This advantage helps free up usable indoor area. The FLX-PRO plenum boxes
are made from galvanized steel sheet and have spigot diameter - 63mm only.
Special versions made from stainless steel are available on request.
The FLX-PRI is a version of this product with insulation made from
9 mm thick rubber foam installed inside the plenum box.
For better system airtightness, it is recommended to use FLX-PLO plenum boxes.