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A powerful kitchen hood that actually captures grease and smoke can create a new problem fast - it pulls so much air out of the building that doors get hard to open, fireplaces backdraft, and conditioned air starts coming in through every crack it can find. That is where the question what is a make up air system becomes more than a code topic. It becomes an airflow, safety, and building performance issue. A make up air system is designed to replace air that is being exhausted from a building. Wh …