5.5 microns is a whole heck of a lot smaller than 1mm 5.5 microns is like .00055mm but 20$ is a bit i can understand that and the +rep is the scales at the top right of my post just saying.... havent actually received rep yet but sometimes these things don't work so if you've hit it already its cool.
Adult mites are the size of a pin head, young mites are microscopic. So I'm guessing that 5 to 10 microns should do the trick. If it can clean smoke particles, I should keep the mites out.
If I use the cone car filter and treat it with oil every few days to keep it moist, then I don't think it matters much how big the micron since the oil witll trap & suffocate them as they try to crawl across it.
I still have to see which is the least expensive solution. I should have my car back tommorow night, so I'll start looking at the hard ware & auto part stores then.
I did +rep you. Just double checked it. When I clicked on the scales it said that I have to spread the rep points around more before I can +rep you again. Not sure why you're not seeing it.
P.S. Which one did you see for $20. That's affordable, the $50 for the cone filter in the above link is a little too much for me right now. (I have to buy 5 bags of Happy Frog, 3qts of MYKEs Tree & Shrub Transplanter, a humidity dome, & 3,000 lady bugs) If I have anything left over I'm going to need more RR trays, heating pads, thermostats, and humidity domes.
I guess I'll have to start looking for a job as soon as I get my car up & running. My Dr. is gonna be overjoyed. lol