Hangzhou Biyou Building Materials Technology Co.,Ltd specialized in manufacture a wide range of weather sealing system and passive fire products. Our products are idea for fire resistance, insulation, smoke sealing and acoustic suppression. We has a group of professional R & D, high-quality products and efficient after-sales service. We have achieved IS9000 certificate, BS/EN/UL Certificate approved by Intertek and other international testing institutions. Most of our products comply with requirements of BS476 part 20-22 and EN BS 1634-3, EN BS13501-2,UL 10C (2009).We have exporting to Europe ,American ,Asia, Middle East as well as other countries.

The Acoustic Door Drop Seals are designed for the gap between the door bottom and floor, it provides an excellent barrier to airborne sound and helping to ensure that the acoustic attenuation provided by a door set . A medium duty, concealed automatic door bottom seal which is mortised into the bottom edge of single action doors. It operates automatically by a spring loaded mechanism which lifts the seal clear of the floor as soon as the door is opened. The sealing gap in 3mm-13mm.

Cutting back length