It's not 100% and I knew it before I bought it, but it protects against most dusts that I'm allergic to, especially plaster dust. The suction is strong, which is good for obvious reasons, but a little problematic for me as I found it difficult to move around, especially overhead and on vertical surfaces. I don't think this will be a big problem for those with stronger hands and wrists. Replacement screens are a bit pricey but despite everything I've pointed out I'm still glad I bought them and will buy them again.
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