How much top rail is needed on a 4041 REG/PA (Rw/PA)?

To install a 4041/4040XP with Rw/PA or Hw/PA arm, you need a minimum of 5-3/8" top rail on the door, measured from the bottom of the stop. If the top rail is less than 5-3/8", you will need to use a 4040-18PA drop plate. The drop plate requires a minimum top rail of 2", measured from the bottom of the stop to be installed.

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