Ross built the air filter using four, 20x20x2, MERV-13 air filters, which Ross got from Filterbuy ( ). For Ross’ DIY system, the filters should be replaced about every six months. Remember that you’ll have to replace the filters every once in a while. Place the fan on the other side and secure it with duct tape.Ħ.
Take duct tape and secure each filter to the fan.ĥ. Place the cardboard on a table and take the four air filters and stack them on the edges of the cutout, with the airflow arrow pointing in (air intake side).ģ. Cut out a piece of cardboard that’s the same size as the box fan to use for the back.Ģ. For about $150, you can have a little piece of mind during wildfires and other disasters that impact our air quality.ġ.
By taking four MERV-13 air filters and duct taping them on all four sides of a box fan, you’ll have a localized air filter for any room you want. If you are unable to acquire a higher rated filter, Ross demonstrates how to build your own DIY air filter. Check with an HVAC technician to check what rating your system can handle. Even if you were to get a thicker filter that increases surface area, meaning less resistance, you’ll have to check if your HVAC system has enough space to install a thicker filter. In many circumstances the HVAC systems homeowners have in place simply aren’t strong enough to handle higher rated filters, as the more filtration the air has to go through, the more resistance it has to overcome. Ross clarifies that homeowners cannot just install a MERV 16 or HEPA filter into their homes. MERV 17-20 are HEPA filters, those are used in hospitals and laboratories. Ratings 1-16 are HVAC use in general, houses usually have around a MERV 5-12 system. The higher the rating, the more effective the filter is at capturing smaller particles.
MERV stands for Minimal Efficiency Reporting Value, a value that measures how effectively a filter stops particulates of varying sizes from passing through and into the air system. Ross explains the MERV air filtration system. Home technology expert, Ross Trethewey teaches how air filtration systems work and how to build a localized DIY air filter. In this video, Ross Trethewey explains how air filtration systems work and how to build a localized DIY air filter. How to Make a DIY Air Filter | Ask This Old House
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