Why this door type
Why door closers particularly benefit from a service contract
Door closers are the most over-looked and least-understood piece of door hardware. They have 2–4 internal valves that need periodic tuning to compensate for spring relaxation, weather-driven frame movement and seal hardening. A correctly-tuned closer brings the door home in 4–6 seconds with a positive latch; a mis-tuned closer slams, stops short, or refuses to close at all. Every uncontrolled close shock-loads the pivot, hinges and glazing. A service contract catches the drift before it becomes the cascade-failure pattern that destroys the rest of the door.
The compliance angle
Door closers must comply with BS EN 1154 (controlled door closing devices). Closers on fire doors must additionally be CE/UKCA marked for fire performance to BS EN 1634-1 and must close the door fully from any open position. Closers on accessibility-required entrances must allow opening within BS 8300 force limits (typically <30N). Closers fitted to electromagnetic hold-open systems must release on fire-alarm signal.