Originally Posted by MacGyver  Consider putting an el-cheapo $2 standard A/C filter from the local Borg store (Home Depot, Lowe's, etc.) in front of your more expensive one. The el-cheapo catches the major junk, the expensive one provides the fine filtering. |
If you're referring to a furnace filter, I tried that. I got the highest quality (captures the smallest particles) filter available and it was like it there was nothing there at all...