Vertical lock rods and top latch mechanism are concealed in the door stile. Depression of the GÇ£crashGÇ¥ bar retracts the bottom rod from the threshold and releases the top latch from the transom bar/header mounted barrel strike. This action permits egress from the building. Upon closing, the top latch reengages the strike securely and frees the bottom bolt to engage the threshold. The door is then locked from the exterior. The exit device can be deactivated or GÇ£doggedGÇ¥ with the cylinder key or Allen screw in the active housing. Housings are cast aluminum with an extruded aluminum crash bar. A rim cylinder diameter of 1-5/32" (29.4) is required.