To make a DIY air filter, you will need:
- A box fan
- 2-4 furnace filters (MERV 13 or higher)
- Cardboard
- Duct tape
Instructions:
- Cut the cardboard to fit around the box fan, with a few inches of overlap on all sides.
- Tape the filters to the cardboard, creating a box around the fan.
- Make sure that there are no gaps between the filters and the cardboard.
- Place the filter fan in a central location in your home.
- Turn on the fan and let it run continuously.
You can also improve the performance of your DIY air filter by:
- Using multiple filters.
- Using a fan with a higher CFM (cubic feet per minute) rating.
- Placing the filter fan in a sealed box.
Replace the filters every 6-12 months, or sooner if they become clogged.
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