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Dr Chris Guz explained that patients often reacted as the breathing tube of the ventilator was placed in their air passage.
BBC: Barry McCarney
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Later, the a tube can be passed down the throat or nasal passages so that air can be mechanically forced in by a bag or a ventilator.
BBC: Minutes matter
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Mr Rogers's home features a heat-recovery ventilator a device in his basement that filters incoming air and exchanges heat between incoming and outgoing air.
ECONOMIST: Green homes