The multi-billion dollar Arzanah medical complex in Abu Dhabi was nearing completion and stood ready to take its place as yet another shining example of the global leadership emanating from the United Arab Emirates. So it was with deep concern that engineers reviewed traverse readings taken from several of the structure’s HVAC risers that indicated leaks were robbing the facilities of half of the air traveling through the ductwork. Not only was this unacceptable from a building code perspective, but it also created significant concerns regarding indoor air quality, building performance and energy costs.