FLX-PRV-...-1-F / FLX-PRV-...-2-F plenum boxes are used for air supply
and exhaust valves. The plenum boxes are made from galvanized steel sheet,
and plastic oval duct connection spigots that are designed to fit
the FLX-HDPE-132-52 semi-rigid oval ducts.
The plenum boxes are available with 1 or 2 oval connection spigots and
SPIRAL duct connection spigots in diameter: 80 / 110 / 125 mm.
Thanks to the low profile of the plenum box, it saves space and is
perfect for concealing with cast-in-place concrete.
