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Elien237
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by
Elien237
8y ago
I’ve been reading and following these comments now and I’m both impressed and horrified at the same time. As a mechanical engineer, product developer and developing air purifiers specifically for 5,5 years in combination of filter expert t
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by
Elien237
8y ago
Particle filters such as HEPA are unfortunately by nature only effective for roughly 6 months, then they are clogged. You can vacuum them to get rid of the biggest particles and then use them for another 6 months (total 1 year), but then th