The Helios Fans ALB-ÜS 60/35 is a symmetrical transition piece designed for linking the ALB 280÷4÷60÷35 ventilation unit to round ductwork. It features a flange diameter of 355 mm and a total installation length of 370 mm. Constructed from galvanized sheet steel, this adapter ensures a durable, corrosion-resistant connection, making it ideal for integrating rectangular units into round piping systems.