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1.Exhaust Gas Passage with Variable Pressure: It is adopted to prevent foul air from toilet and kitchen; check valve is added at the joint.
变压式排风：为防止卫生间、厨房排风井内的污风反窜到室内，排风道采用了变压式排气道，并在封到接口处增设了止回阀。收藏指正
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