Conceal type Automatic Drop Down Seals / ADDS-A

Concealed automatic door bottom seal. Spring loaded mechanism  with silicone insert. Tested for acoustic performance with BS EN ISO 10140-2: 2010. Meets the smoke leakage performance requirements of BS476:Part 31.1: 1983. Suitable for use on fire doors under conditions of BS 476: Pt.20/22: 1987. Durability tested for over one million open and close cycles. Length as per door width. (suitability of the mortised auto door bottom to be confirmed  as per the exact door thickness at the time of order)

The BIYOU Fire & Acoustic Automatic Drop Down 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 .

The BIYOU Fire & Acoustic Automatic Drop Down Seals control the movement of the inner sealing strip through mechanical movement. When the door is closed , internal sealing strip will be down automatically to performance the tight sealing effects. When the door is opened, the inner seals will be automatically rise from the floor. Some of this serious seal can be fully hidden in the door bottom groove, the door beautiful surface will not be affected by installation of the seal.

A medium duty, concealed automatic door bottom seal that is mortised into the bottom edge of single action doors.

Cutting back length

We support customized the lengthes, we could make it from 200mm to 3000mm.

Tested by

BS EN 1191: 2012 opening and closing 100000 cycles

ISO 10140-1:2010 for acoustic rating of 40db

UL 10C 60 Mins Fire Resistance Test and Hose Stream

The length could cutting back as request