Range of in-line fans for circular ducts, designed for high aerodynamic performances with a very compact profiles and very low sound levels.The range comprises 7 diameters and covers a flow range from 260 to 1080 m3/h.Low profile compact casing manufactured from galvanised sheet steel. The terminal box and the mounting bracket do not increase the product’s profile.Optimised design of the impeller, guide vane and outlet diffuser, manufactured from injection moulded plastic, to increase performance and lower the sound level.