what standaard mullion

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Question
Answer
To use Von Duprin mullion for something other than our standard strike, order the mullion "Blank" and prep in the field.
With a mullion: Use the standard strike 267 With no mullion and inactive leaf being held closed with flush or surface bolts: Use the 2609 double door strike
Von Duprin KR (key removable) mullions requires a 1-1/8" or 1-1/4" mortise cylinder with the standard straight cam, the cam is not inverted. Please see chart below for part numbers. 
instructions