我的炉子和空调应该使用哪种空气过滤器？

Hopefully, you know that you should change you furnace and A/C filter every couple of months. But what kind of air filter should you buy? 希望您知道，您应该每隔几个月更换炉子和空调过滤器。 但是，您应该购买哪种空气过滤器？ If your HVAC system

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