There are different strengths of overhead door closer – how do I know which one to choose?
A. Overhead door closers are manufactured with either different or adjustable strengths to cater for the size and weight variation of different doors. The bigger and heavier the door, the greater the force required to close it. This force is usually designated by assigning the closer with a number value between 1 and 7 where the higher the number indicates a larger capacity of closer. The following chart shows the test door mass/size for the seven identified grades under the BS EN 1154 classification (a recognised standard for classifying door closers).
