The Yale B-4000 is designed to automatically shut the door it is installed on, and can be adjusted for use on any of the following doors:
- Size 2: Maximum weight 40kg, maximum width 850mm (non-fire doors)
- Size 3: Maximum weight 60kg, maximum width 950mm
- Size 4: Maximum weight 80kg, maximum width 1100mm
When utilised in size 3 or 4 applications, it is suitable for use on fire doors. It offers not only ease of use and installation, but also a stylish silver finish that can blend seamlessly with any decor.