SE | Overhead Door Closer with Link Arm | With Delayed Action | Suitable for Single Leaf / Single Action Doors of up to 1400mm wide | Suitable for Right & Left Hand Doors without Adjustment | Suitable for use on Smoke/Fire protection Doors | Closing force to EN 1154 Size 1-6 is Infinitely Variable | The Back Check and Thermo-Constant re adjustable | Features a Safety Valve for both the Open & Close Directions | Optional designer covers available