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not only do i need to pay special attention to its price, brand and other factors, but when i choose to buy a fume purifier. therefore, the following points need to be considered: whether the bad environment matches the product; whether there is a suitable intermediate position to install; whether it is more convenient and clean after use; whether the overall cost of daily maintenance is suitable; whether the seller's credibility is high, etc. we must fully consider these external factors in order to buy a fume purifier that is very suitable for him to provide protection for the family and the public and health.