The LSC has a lot of information regarding doorway openings in Smoke Partitions and Smoke Barriers and how to protect them. But there is nothing I can find that discusses how to protect an opening that is not a doorway and is larger then 80 sq. in. There is no mention of fire shutters, or fire/smoke curtains that have been tested to meet NFPA 105 and or NFPA 80 that might otherwise be used to protect such an opening like a pass through window. Does anyone know how to properly protect a large opening through a Smoke Partition or Smoke Barrier that is not a doorway other than using a door?