On-floor installation duct lower section, 1-compartment, for blind/assembly covers with one-sided bevel, with attachable aluminum side profiles for supporting and fastening the duct covers, base tray with retaining tabs for max. 2 insertable, self-contacting dividers and embossing for protective conductor connection angles. Duct height suitable for setting up Telitanks or for installing device inserts of nominal size 4, 6, 9.