Knut Bø TUBO 100TP is a 4-inch (100 mm) inline pipe fan for insertion into round duct runs, with a 100 mm impeller diameter. The compact 100 x 100 x 90 mm plastic housing carries a 230 V 50 Hz single-phase motor rated IPX4 for general splash resistance. Manufactured in Italy. Typical applications include bathroom exhaust extensions, kitchen extract branches, and short in-duct boost installations in residential and light commercial ventilation.