The work addresses a practical bottleneck in the AEGIR renovation concept: prefabricated facade modules that combine windows, insulation, electronics and ventilation ducts in a single element. Routing those ducts by hand is slow and does not scale to industrial prefabrication. The team designed an algorithm and a tool that automatically find a set of duct routes that reaches every air outlet without crossing each other or clashing with windows, while keeping pressure loss to a minimum. 

Validated on 250 synthetic facades and four real ones, it routes a complete facade in less than 60 seconds. Benchmarked against manual design, it produced on average 8.5 % fewer bends and 5 % shorter duct runs, reducing the pressure losses and thus overall energy consumption of the system. Beyond ventilation, the method generalises to other network-routing problems such as water piping and electrical cabling. 

The corresponding conference paper will soon be made available online.