Conceal type Automatic Drop Down Seals / ADDS-B

The Aluminum automatic drop down seal consist of aluminum section which surrounds a movable drop down seal is actuated by a plunger which contacts the jamb as the door is closing, forcing the drop door seal down against the floor on threshold.

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.

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