Hey got a new cabin filter to replace since my mom probably never did it… and as expected it was all black and crudy. I also went with a charcoal activated one from FRAM.
Now the issue is, well, I’m not sure really let me explain.
The airflow arrow on the filter should be pointed down since that’s how it goes. But the problem is have to notch the sides of the filter onto the notch that run on each side of the filter tray (picture for reference). Installing it with the arrow flowing down doesn’t fit in those notches because the filter pleates are to fat (picture). But installing it the other way around (arrow going up) it fits perfectly because the side pleates on that side are made to fit (picture)
So I’m at a dead end and not quite sure. Any inputs on this? Car is 2006 Hyundai Tucson by the way.
The FRAM filter model is CF10709. The filter the was in the car before has “08790” and ‘2E200A’ on it. Can’t roate any 90 degrees since one side becomes to long.
For the flow, I thought that it goes through the white pleat to filter out object and such and then goes into the charcoal for the odor and doing the opposite might screw it? I can still put the way with arrow pointing down it’s just the sides won’t be perfectly anchored in and there may be like a microscopic gap between the sides.
You logic seems sound OP that the preferred path should be having the air flow exiting the charcoal side of the filter. But in practical terms I doubt it matters enough to worry about. If the one you are using is a little less expensive than the OEM filter, then take advantage of that price difference by changing it a little more frequently. You should be good to go.
I expect you already know that the entire past century of cars (i.e. the 1900’s) had no cabin air filters at all, and that configuration seemed to be ok for most drivers. Any filtering at all is better than that 100 years.
In general. you want the rough/tough looking side toward the cabin. They are made that way so that pieces of the filter element don’t blow into the cabin. I hope that might help. On that theory, the charcoal side does not face the cabin.