Are Particle Counters and Government Machines the Same?

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Ryan Rose

For a DIY filter, which HEPA do you recommend? (Shipping is just too discouraging.) We checked Amazon but they’re out of stock, as your webpage also says (12-1-19).
Have you or others factored in or out the effects of humidity? I live in the Southwest US where humidity is almost always low, which it seems to me should be a positive in terms of mold, etc., growing on and eventually blowing out of the filter medium.