I have a few, like maybe 6, and they are wonderful. Tried using the fabric furnace filters and they just don't get it.
One is set up adjacent to the saw and catches most of the dust from both the blower and the fall-out from under the saw. I need to move it depending on the size piece I am working on, but closer is better, but even moved away it does a decent job. I don't get the fine dust on everything and very little hits the floor. One thing I noticed is the variation in effective fan speed, some fans are just better and they are all in the same box. Oh well....
The forward part of the screen is quite large on the gaps, but they get a lot smaller as you go through the layers. They work well. You spray both sides and let it dry. They are washable, flush it off and let it dry, spray it and let it dry, and off you go. If I wash it at the end of the day and spray it first thing, I usually have enough prep to keep me busy until the spray has dried.
They also work for sanding and other dusty activities. The reason I have so many is some are in Alaska and some in Washington. Just easier to carry just a few things, but still a load.
