Double Fire Doors: How to Find the Leaf That Should Arrive First

Double Fire Doors: How to Find the Leaf That Should Arrive First Related diagnostic: Door Selector Fault or Closer Fault? A Pair Test That Saves Guesswork explores the connected fault pattern and helps compare the evidence before choosing a repair. On a pair, "both close" is not enough. You need to understand the intended sequence and which leaf should arrive first. What the pattern is telling you Many pairs have a practical master and slave relationship. A brush seal or meeting detail can be a useful clue to the slave role, but the exact doorset must verify the sequence. For closer faults I would record exactly when and where resistance or interference appears. Check the arm, shoe, body mounting, hinges, seals, latch/keep, frame and bottom interface before changing hydraulic settings. Closer power is an input into the system; it does…