Automatic Drop Down Recessed Door Bottom Seal Fire Sound Dust Wind Proof

Designed for soundproof and fire resistant doors and for wooden doors.Assembly inside of the door panelIts avoid to pass cold and hot air and Its provides isolation Product is prevent to wind, dust and soundDue to mechanism door is opening and automatically closingEasily adjustable without tools , piston etc..Press Highness 20 mmShortening size 100 mmMechanism working from 2 different point so its shows stable and lasting performanceIts close the gap from 0 to 20 mm in the bottom Pressure adjustment applicable to mechanismIt fills the cavities with the spring mechanism and its press from the double point and covers the ground defectsIts block to light infiltrateReduces the energy consumption because of the gap in the bottom is closed with this productBlock the insect passingWhen the door is opened, there is no mechanism accessory on the floor.It make easy to pass disabled peopleHidden application model prevents image dirtiness