The Helios Fans ALB-ÜS 50/30 is a symmetrical transition component designed to connect the ALB 220÷4÷50÷30 ventilation unit to round duct systems. It features a 315 mm flange diameter and a total installation length of 320 mm. Manufactured from galvanized sheet steel, this adapter offers a strong and corrosion-resistant solution for secure integration into round ductwork configurations.