Silver (SES). The Briton 1100 Overhead Door Closer is ideal for medium duty application, such as offices or living accommodation. It features adjustable closing and latch speeds, with concealed adjustment to prevent unauthorised changes being made to the closer. It is suitable for fire doors (Certifire Approved CF388 - tested to 2 hours), and is also successfully tested to EN1154 & EN1634 recommendations. It is reversible to suit both left handed and right handed door applications and comes complete with a 10 year guarantee.. 10 year guarantee. Concealed adjustment to prevent unauthorised adjustment to closer. Matching Arm. CE marked