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I was not sure on which site to ask this question, but I guess Engineering might do well from the aspect of matter.

I am wondering, what is the shelf life of a HEPA filter, can I just buy a few of them for my air cleaner and let them sit in my drawer?

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  • $\begingroup$ Don’t shops let them sit on their shelves? They should be fine... $\endgroup$ – Solar Mike Dec 28 '17 at 10:47
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Air filters are made of fibrous material (paper typically) that is basically inert. There is no reason that storing it in a cool, dry place would cause it to expire.

The HEPA designation has more to deal with how the air flows through it rather than the material that it is made from

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