They are used on fire doors to help prevent the spread of flames and smoke in the event of a fire. Open the door 1 inch 2 5 cm if the closer is under too much tension to slide the pin out. Reduced opening force cr441 door closers important any door closer including those certifi ed by bhma to conform to ansi standard a156 4 that is chosen installed and adjusted based on ada or other reduced opening force requirement may not provide suffi cient power to close and latch a door.
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