MERV 13 Filter

This filter type is widely available and cost efficient, with many brands offering filters sized 16X25x1" for less than $20.00. One can explore Amazon to locate and purchase a filter and the chart below explains the MERV rating system.

 Image Source Link: MERV Rating ChartImage source link: MERV Rating Chart

As shown, the higher the MERV number rating, the more efficient the filter is at trapping what are reffered to as "dust spots."

The MERV 13 material can be removed from cardboard and wire form and cut into the desired size to fit 3D printed masksor into a stand-alone mask.

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