waddycall
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I’d want mechanical extract with an interlock. For some reason plant rooms often have mechanical supply to low level and natural ventilation at high level. I think it’s possibly due to sizing issues. I’d rather know that any leaks of exhaust/flue gasses are likely to be sucked out and have a defined exit path. If you blow air in and pressurise the room there’s no control over where leaked gasses go unless the room is otherwise airtight.