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[Lewis Coates]

I will go with second one, not to clean because i had an experience to see closely(metallic netting removed and all parts separated) how that HEPA filters look from inside.

Behind that metallic netting very fine delicate hepa filters are there that can damage even with a light pressure. So in my opinion if necessary (in case of spill etc.) you can clean it with light hand, but if not then one blower is there behind HEPA filter that will clean it automatically during time of stabilization.