This patent self descend system is to protect human and building in case of fire.
It could be additional mount with a timer so shutter door could do twice descends.
As well as connect with smoke sensors.
Or connect with UPS.
We also have auto/manual shutter door,escape shutter door,spring shutter door,simple fire prevent shutter door....etc.
This member assumes full responsibility for the content of this listing. DIYTrade accepts no responsibility whatsoever in respect of such content. To report fraudulent or illegal content, please click here.