SC. The Samuel Heath Perko Powermatic R100 is one of the world’s most advanced controlled, concealed door closers. This reliable unit possesses many unique features that make it an ideal choice for both fire and non-fire door applications in social housing, hotels, educational and healthcare facilities.. Suitable for doors up to 80kg in weight and 950mm wide (BS EN 1154 size 3 test door 60kg). Adjustable closing speed and power latching action. Unique twin power mechanism. Suitable for latched and unlatched installations