The ducts are made by juxtaposing GEOTEC®S boards 1000 mm long and 30 or 45 mm thick. These systems are available for fire classifications EI 60S to EI 120S : firewall 1 to 2 hours, according to EN 13501-3 and EN 13501-4.

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All the boards are moulded to standard dimensions with a rabbet on all four sides for 45 mm thick ducts and on two sides for 30 mm thick ducts, to facilitate their assembly. Each segment of length 1000, which can be cut to length, consists of four or more boards.

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GEOTEC® ducts can also be made with GEOTEC®SX boards 1000 mm long and 1200 mm wide for 30- or 45-mm thickness. These single dimension boards do not have longitudinal rabbets for easy cutting and assembly.