The first chain drive with undisputed performance.
The KA 30 is the first chain drive that D+H developed and manufactured itself. Its performance data with a stroke of up to 800 mm and 300 N of force gave it a unique selling point on the market in the mid-1990s. Its invention with a solid side bow chain made it possible to install a window drive immediately adjacent and parallel to the sash, meaning it did not protrude into the room as had been the case with rack and pinion drives up to that point. The KA is the device that does it all among D+H chain drives and remains a timeless classic.