Rehau System 4500 windows and doors are a high-performance solution for large openings in commercial applications, according to the company. Compression-seal technology, multi-point locking hardware and a glazing capacity of up to 1 3/8 inches create a durable barrier against the exterior environment. The system insulates occupants from outdoor drafts and noise with a simulated U-value down to 0.17 and an acoustical rating up to STC 43/OITC 34.