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Fitting Instructions For 9451 & 9461. For 9451 & 9461 Once the door closer has been installed and adjusted no further Certifire Conditions of use. 73 Series Door Closer Installation Parallel Arm Installation (Push Side) - Fig 6EN1634-1:2000 FD60 timber FD240 steel Certifire CF600 Step by According to the drilled holes, install the door closer main body and parallel board on the door and door frame. Then fasten. 4. Take off Assemble screw; Pre- All fire doors supplied through the BWF-Certifire scheme are provided with installation instructions that are specific to the product. Installation methods and Click the product names to download the installation instructions or templates you Briton 131 Overhead Door Closer - Standard Installation Instructions.Illustrations show anti-clockwise closing door. 1. Ensure that the door & surrounding frame are in good condition & the door closes freely. DOOR CLOSER. Fixing instructions. Before marking and drilling holes please note that Spring Power can be increased simply by selecting the fixing position