Avoid direct contact with the filter element (white cloth-like material). Filters should be replaced every 6 months to maintain the rated performance. Depending on the degree of use, a filter may need to be replaced every month or any other interval up to 6 months. In case of any damage to the filter, replace it at once. NEVER use compressed air to 'clean' the filters as it may compromise the efficacy of the filter and the rated filtration. Carefully remove any debris with a light, clean, non-abrasive cloth with minimum pressure. With every other bag change the filter should be removed and the seal (including the filter and the area on which it mounts) should be inspected for debris that could compromise the seal. The HEPA filter should be visually inspected at every single bag change. Though it is not possible to apply a hard and fast rule across the spectrum of users or applications, we can provide these basic guidelines: The RRP rules do not provide guidance on this matter, and each different manufacturer may have their own stated guidelines or recommendations. Foremost, we strongly urge the use of pre-filter bags which filter dust down to 5 microns, helping to prevent loading of the main HEPA filter, and protect the filter from damage from larger particles of dust and debris. This is highly subjective depending on degree of use, including frequency, duration, and conditions. Here is an FAQ that was written for RRP, but it also could be applied to general use. So, if we use unmodified bags (not cut - I empty mine but don't cut them) how long should the HEPA filters last? I'm thinking that if the larger particles are kept out of them then they should last many years, even longer with careful cleaning. We went almost a year (if I remember correctly) before changing them and they were almost black by then. Then we put magnehelic gauges on the filter banks and used that to tell us when to change the filters. When I worked maintenance in class A high rise office buildings in Atlanta we would change the filters about every 3 months or when they "looked" dirty. Filters can also be cleaned and reused many times as long as you're careful to not damage them.
Most people change their filters LONG before they need changing. My understanding of filters is that once they get some dirt in them they become more effective. The HEPA filters, how long do they last while still being effective? Did a search and found nothing which is unusual because I can almost always get an answer using the search function.
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