As Erich said, if the deck goes full width, your only issues are incorporating a firewall in the structure to match the FC line, and how to seal the small gap between the sides and proscenium. If your platforming is not full width, different story. There is no hard and fast code answer and only the local AHJ can approve any solution. What I have done a couple of times is design the deck with a "joint" about 3"-6" down of the FC line. The upstage section is not fastened in any way to the downstage section. The upstage section is on either casters or skid tracks. The up stage section is attached to a winch capable of moving it at least 12"-18" in about 15 seconds with twice the weight of the maximum number of cast on board. The motor control must be tied into any electronic FC release if possible (such as Sure Guard or similar) and have a contact switch mounted as high as possible on the smoke pocket on each side. There is also an E button on each side of the stage. All of these devices are independently redundant and trigger a latching relay to activate the motor. In one venue I had to have the motor power supplied by a portable generator that was running at all times while there was an audience present. Of course you have to have drawings, specs for the AHJ to see and most will want to see a demo at least once. There is no guarantee that your AHJ will approve it, this is just what has worked for me in the past. Oh, and design your floor plan so that there are no pieces of furniture or other obstructions over the break line. Your AHJ may require any furniture or set pieces be anchored to prevent accidental movement into the curtain line. HTH.

State by state, sadly differs in enforcement of Fire Regulations. My take, for all my years, is the need for the fire curtain TO FULLY DROP AND CLOSE THE PROSCENIUM OPENING. Scenery which impedes this line does not fulfill the total impact of the regulation and the reason for its existence in the law. As some people know, having initiated the original regulations for fire curtains over a period of many years with Bill Conner taking the lead after some time, the regs are what they are and must be enforced. My experience has not seen Deluge curtains which actually work in real life. The AHJ is always the final word, but having the Insurance Loss Control people in on the actual condition is an intelligent move. Dr. DAVIDSON

Always get it in writing from the most responsible party you can think of. A note...a FM in the local jurisdiction may have no idea as to the proper implementation of the correct fire code. Keep handy your current copy of the NYCFC. and when in question call someone in the state capital who can advise, but get it in writing! Just remember that the purpose of a fire curtain is to prevent the stage becoming a chimney. One solution I got OKed in the past was to produce a fire proof negative mask that traveled with the fire curtain. From the point of contact I constructed a fireproof shield that flew in with the FC and butted up next to it so the was no air being drawn under the curtain. This can be easily confirmed with a smoke test.

Just so you know the facility I am currently working in received it's occupancy without having handicapped access from the stage and that was 5 years ago and to this date still no access. The emergency button in the elevator does not sound and the emergency phone goes nowhere...I love value added...