The workshop type ceiling hanging filters are actually quite effective in my experience, There are quite a few out there for reasonable money. Woodshop particles are rarely under 0.25 micron in size, unless he is working with stone or metal, he is unlikely to see anything smaller. Excepting smoke particles. Electrostatic precipitators are rarely used in workshop environments, because of the ever present danger of ignition. I worked in a medium sized woodshop in St. Petersburg, and one day, when the sanders were first set running, there came a very loud roaring noise, like a pulse jet engine being started. It was a steady drumming and booming noise, punctuated by brief eruptions of yellow flame from the overhead dust collection junctions, leading toward the 20HP collector on the other side of the building. The static electricity created by the air motion was igniting the fine dust created by the belt sander. A series of ground leads was hastily wrapped around the PVC pipes that day, and the problem disappeared. Wood dust ignites easily!  |