Inner filter efficiency. the percentage of particles captured by the inner filter. this is typically measured in microns where one micron equals 1/1000th millimeter. Instructions. step 1. screw the tapered legs into the angle top plates and measure for placement on the underside of the 3/4" laminated pine. i set my legs 5" from. Wood news online, a free woodworking magazine and newsletter for woodworking..
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