dust control vent filters: Breathe easier and dust less often with these handy filters that fit easily into vents. Warm air from your furnace or cool air from your A/C will be filtered every time; will not affect air flow. Unscented polyester filters measure 4" x 10" and will last up to 12 weeks. Perfect for allergy sufferers! Controlling dust and pollen will also mean you'll be dusting less often!
Woodworking Tip: Box Fan Filter " I made a cheap air cleaner for dust in my shop by attaching a furnace filter to a box fan. I just set the fan on my workbench whenever I’m sanding. It works so well that I decided to make a more permanent air cleaner. I mounted the fan overhead, attaching it to the floor joists in my shop, see drawing."