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Heat build-up in corridors or lobbies of residential and hotel buildings is a common problem with a simple solution: use the smoke shafts already in place. These are typically positioned in a way that also provides effective environmental ventilation, so they can serve a dual purpose of evacuating smoke in case of fire and providing day-to-day ventilation. However, the design and controls need to be well thought through and there are some pitfalls to avoid for the solution to deal with overheating effectively. We have listed 3 key considerations below.