Use of smoke ejectors to expel smoke and draw fresh air into a structure is a use of:

Name: Use of smoke ejectors to expel smoke and draw fresh air into a structure is a use of:
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Smoke ejectors used to expel smoke and draw fresh air into a structure operate by creating a lower pressure inside the structure compared to the outside, which is a principle of negative-pressure ventilation (NPV). This method involves removing smoke-filled air to create a pressure differential that pulls in fresh air.

Use of Smoke Ejectors to Expel Smoke and Draw Fresh