S-Böj Beräkning is a free Android app developed by Jannes Vent AB that helps ventilation fitters to measure the length of spiral channels, choose bends, and size duct systems. With this app, you can easily calculate the length of the channel by entering the diameter and center offset and get suggestions for the channel length in relation to the angle of the bend.

The app provides an easy-to-understand overview of which lengths work for any angle. You can also use the flow table to choose the size of the spiral duct and dimension throughout the ventilation system. The app is designed to simplify the everyday life of ventilation fitters without any fuss or hard tables. With its clear and concise interface, S-Böj Beräkning is a must-have tool for any ventilation fitter.