How to Make a Home Air Filter
Using small strips of duct tape, affix the filter to the intake side of the fan.
Turn the fan on to its lowest setting.
Place the fan in a bedroom, to help you breathe easier while you sleep; in a basement, to filter out mold spores that can cause allergies; or in an open window (facing inward).
Things You Will Need
- 20-inch box fan with variable speeds
- 20-by-20 inch furnace filter
- Duct tape
- Furnace filters made of white, accordion-pleated material and marked "HEPA" are very effective and cost about $7 each, or less if purchased in multi-packs.
- Change the furnace filter once every month. In a very dusty environment, you might want to change the filter more often.
- Run the home air filter in a bedroom for a couple of hours before bedtime to help clean the air.