In rectangular duct prefabrication product category, You can find parts that will
help You to manufacture rectangular (square) ducts and fittings on your own.
Mainly, PQ flange profiles, NQ duct flange corners, available for the 20, 30 and
40 mm profiles, made of galvanised, stainless steel or aluminium sheet.
In order to achieve class C airtightness of ductwork, we recommend
choosing PQ-SIL flange profile with injected sealant.