Originally Posted by UG_Passat
Originally Posted by slacktide_bitog
The flow numbers don't mean much without a control
To make a better comparison, you'd need to run the test with
-no filter installed
-an OE cabin filter
-the MicronAir blue
Then, after a year, or whenever you change the filter, run the test with the used filter
If Bosch makes one of those HEPA cabin filters for this car, run it with one of those, too
It's a start to quantify the complaints I have about the so-called "upgraded" filters that are supposed to be superior.
It takes time to gather data, especially to track flow after mileage.
Since you seem to be openly recommended these filters, why haven't you thought about doing this informal study?
They're not available for my car
Also, I haven't noticed a noticeable reduction in airflow on any cabin filter I've installed, be they carbon/charcoal or not. Supposedly, the HEPA filters do restrict to the point you'd notice, but those are geared towards those with severe allergies. If I had allergies that bad, it would be worth the tradeoff for the HEPA.
The reason I recommend the filters is because I find the carbon to be useful in taking out odors. The mold layer would probably help, too.
The car I have now has a sticker in the door jamb that says to call the dealer if you notice a restriction in airflow and it's not time to change the filter yet. My previous car didn't even have a cabin filter
I was able to find a filter with charcoal, but I had to order it from Europe and it took me almost a month to get it, but I'm glad I did
Regular replacement every year or two is likely more important .
The wind speed meter is cool