3 ms·
These filters probably do really age out, though perhaps more slowly than the DRM There is a mechanical filter that will be cleanable, but the HEPA filter work
by ajb 3y ago
These filters probably do really age out, though perhaps more slowly than the DRM
There is a mechanical filter that will be cleanable, but the HEPA filter works by having an injected electrostatic charge which will leak away over time, and the activated carbon will deactivate over time.
It would be interesting to know if there are statistics on how quickly those processes occur, and whether they are affected by volume of air or just elapsed time
- fsckboy 3y agodon't forget volume of dust
- amluto 3y ago> the HEPA filter works by having an injected electrostatic charge which will leak away over time Nope, HEPA filters are not dependent on electrostatic effects and do not magically start leaking. When they are too loaded with dust, air has a harder time getting through, which is the main factor that causes them to need replacement.
- steve_rambo 3y agoThey also get more efficient at filtering out PM the dirtier they are, not less.
- ajb 3y agoI can't edit my comment any more, but on researching, I see you are correct. I thought I had read that HEPA used electret material like FFP3 filters, but most do not.