Build a Woodworking Dust Filter Air Purifier DIY 100 bucks | Part 1 ✔

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I decided against buying one of the popular $300-400 air filters for my wood shop. Instead I purchased a 8" 800cfm blower (that I previously used to convert a window AC to a indoor AC but that's another story). I then built a cabinet to hold the blower and a 20x25x1 furnace filter. Dust collectors are OK but they don't really filter fine dust. The smallest (and most irritating dust) always gets through the bags. Not to mention the stuff the dust filter doesn't catch in the first place from the table saw, router or sander. That's where an air filter like this helps out in a big way by trapping all the fine dust particles. This particular unit I built will take the air from a thick haze of dust to completely clean in about a minute in the 12x15 room I have my table saw in. The filters do get clogged up if I'm sanding for a while but I've found I can take them outside and blow them off from the backside with my air hose and they're reusable for at least 5 times. After about 5 times of blowing them off the filters I've been using seem to loose their effectiveness and should be replaced. This is hands down one of the most useful things I've made, you don't know how much you need it until you have it in use. My breakdown of costs: 8" 800cfm Blower - $60 shipped from ebay auction Three quarters of a sheet of 3/4" 7 ply Arauco Pine plywood - $25 First Air filter - $4 99 cent cans of spray paint and clear coat $5 electrical handy box and switch $5