Flat pressed galvanized sheet straight branches without gaskets are used for fabrication of expansion boxes in air supply diffusers, and wall-mounted and ceiling air diffusers. The sizes 63, 75 and 90 mm are prefabricated for FLX plenum boxes installed with FLX-HDPE ducts in FLX-REKU air distribution systems concealed beneath suspended ceiling panels or raised floors. ILPF units are available with female-end flanges. The flange can be fitted with a gasket; ILPL units are provided with factory-installed EPDM gaskets on the flange.
ILP-...-C units have bare edges for fabrication of expansion and diffuser boxes and other ventilation system components