Vents TT 125 duct ventilation system with a diameter of 125 mm and ball bearings. This fan is easy to maintain and has two power levels and an external switch. Ideal for small and medium-sized rooms such as toilets, kitchens, offices, greenhouses and nurseries. Suitable for medium distances in ducts. The ball bearings ensure a service life of 40,000 hours and allow vertical or horizontal installation.