Our Steel Acoustic Door Range is designed to reduce sound transmission between rooms and to provide sound privacy in any architectural or industrial environment. These comprise of a range of single and double leaf acoustic door sets suitable for internal and external use, available in either Rw42dB or Rw53dB ratings. The Dorsonic 4ooo Range Steel door is extremely tough. With a unique sectional frame and 1.5 or 2mm steel skin the door skin rides smoothly on steel hinges with integral ball bearings. Assembled to the highest standards it will stand many years of intensive use.