cheap carbon filter

  1. LEDRF

    $10 to $22 Carbon filter Charcoal

    Here is what I did. I already had bought 6 inch ducting at Home Depot for $12 for 8 feet of it. The 4 inch is even cheaper, if you use 4 inch fans. Anyway, go to Walmart and buy a carbon filter. The one I bought costed $10. If you already have ducting, then you only need to spend $10. Wrap it...