what is stab for mullions

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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.  ...
Minimum door opening for a 98/99 rim device with a 4954 mullion and 299 strike is  26.687" (26 11/16")
Bottom mounting fitting on 9954 is taller than 4954. The taller bottom fitting is required for a fire rated application.