subject: Rating An Air Purifier---5 Easy Ways to Rate An Air Purifier's Effectiveness [print this page] Pro-rated Filter Warranty---One of the best ways to tell whether the filter will last is to look at how long the manufacturer will guarantee it to work. A 5-year prorated warranty on a filter lets you know that the company is serious about the filter lasting and is willing to pay if it doesn't. That kind of guarantee almost insures that you want have to use it.
Rating An Air Purifier---5 Easy Ways to Rate An Air Purifier's Effectiveness
