We’ve normally operate our test units 24/7 for a minimum of a 12 months—in one circumstance, for two decades—and then retested them using the old filters and as opposed them with brand-new kinds. In every single situation, there’s been practically no drop-off in functionality for this purifier. (Sometimes, we’ve even https://socialrus.com/story16604714/quiet-bedroom-air-purifier-for-dummies