ILS flat segmented galvanized sheet straight branches without gaskets are used for fabrication of plenum 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. ILS branches can be expanded to match the joined diameter, and there are ILSF branches provided with factory-installed female ends. The branch can be fitted with a gasket;
ILSL branches are provided with factory-installed EPDM gaskets on the branch.
