The surface wall mounted, door hold-open electro-magnet, is built around a white, robust facia plate for flush mounting on a standard electrical back box. A springloaded pin ensures zero residual holding force. For surface mounting, it is supplied with pressed steel surface mount box with 20 mm knockouts. This product has been successfully type tested to EN1155 and is CE marked under the Construction Products Directive. · · · Surface mounted as standard or can be fitted flush using 1 gang 35mm deep box (not supplied) · · Robust metal construction · · Operating Voltage 230V AC · · 20kg Holding Force (200N) · · Zero Residual Force · · Approved to EN1155 and CE Marked · · Supplied with adjustable keeper plate · · An integral manual release button, allowing the door to be closed without operating the fire alarm · · IP51 Protection · · The 230V AC unit includes a filter for EMC emissions.