so, I bought a 2nd hand metcal BVX-201 with very low use a few months ago, and am now getting it setup in my lab.
But when I just opened it up to look at it, seems that the HEPA filter has been installed backwards (text is right way around, airflow direction arrow definitely the wrong way around) and used like that for, I assume, as long as this filter has been in there.
Now I'm wondering, do I just flip it back the right way and use it? or should I man up and spend the extra $ to replace it upfront?
I'm not at all an expert on what a HEPA filter even is, let alone how it works, and what would happen if it was reversed and then turned the right way around, so I'm all ears if someone who does know about these things wants to tell me about anything horrible that could happen if I do flip it and continue to use it.
PS, it has been used with the pre-filter (as designed) which is looking a bit grey and was covered in dusty crap before i vacuumed that off, so there's not likely to be anything large particle wise on the "out" side of the filter, just whatever small stuff made it through the pre-filter originally.