Is the HEPA Filter in Air Purifiers Washable?
Are the HEPA filters in air purifiers washable? The answer is a definitely NO.
The HEPA filter is a layer of fibers that are arranged intricately. It’s precisely due to this arrangement that when the airflow come through the fiber layer, the bigger particles can be intercepted and accumulate on the surface of the filter. HEPA stands for high efficiency particulate air, and this filter can intercept over 99.97 percent of particulates in the air. It is the structure that decides the function of the HEPA filter. If you wash it, the structure can be destroyed, and of course the filtering function will be lost. You may argue that the fibers are still intact, but actually the arrangement has already been destroyed.
Recently, some air purifier models have claimed that their HEPA filters are washable and have classified themselves as “HEPA 4” air purifiers. However, their certifications have not been confirmed by any authorities. Also, there are no related studies to show that those washable filters can still function well after being washed. Their only reason for claiming to be washable is that their filters are not falling apart after washing. Basically, they don’t guarantee their performance after you wash the filter.
There is no doubt that there will be washable and reusable HEPA filters in the future because of advancements in technology. But until now, there has been no authority-certified washable HEPA filter on the market. This means we should prepare to change the filter when it is needed.