Galvanised steel insulated plenum for supply grilles FRE. Mechanical air flow. Round/elliptical connection for round duct that can be adapted to front or superior round sleeve. 

Compatible with AirQ supply grilles without regulation elements.

For plenums measuring 500x150 and 600x150, the plenum includes two necks for the connection to the flexible duct. Take into consideration the Y-branch elements that are necessary for the connection.