FIRE RATED KEYED REMOVABLE MULLION, 7 FOOT, RIM CYLINDER SOLD SEPARATELY. NOTE: FIRE RATED LISTING ALLOWS FIELD LOCATION OF STRIKE. DETEX FIRE RATED MULLION CAN BE STRIKE-PREPPED IN THE FIELD. DETEX FIRE RATED MULLION CAN BE USED WITH OTHER MANUFACTURERS' EXIT DEVICES THAT ARE FIRE RATED FOR PAIRS OF DOORS WITH A MULLION.