mullion bottom fitting

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Answer
Bottom mounting fitting on 9954 is taller than 4954. The taller bottom fitting is required for a fire rated application.
The part number for a Von Duprin 4954 mullion bottom fitting is #050390.
Minimum door opening for a 98/99 rim device with a 4954 mullion and 299 strike is  26.687" (26 11/16")
There is not enough room to install two 6111 electric strikes back to back in 4854 mullion.
The Von Duprin electrified steel mullions, 4854 and 9854 come with a quick connector that connects the electric strike wires from the mullion to the frame through the top fitting.  ...
Aluminum mullions 5654 or 5754 are not designed to accept any electric strike including 6300 surface mounted electric strike.