Schlegel silent-fin is often replacing standard seal because not only does it have superior sound proofing like other Schlegel seals, there is an added advantage of noise reduction during use. It also has cold smoke, weather, draught, dust, and light resistance. It has excellent energy efficiency and eliminates air infiltration and water penetration. It performs well over a long period of time. The quality properties are similar to other world leading, unparralleled Schlegel seals yet with two soft bonded fins it ensures quiet operation.