Covid Action Cowichan

Filter Materials

*WARNING* Not all HEPA filters are safe and MANY utilize fiberglass! 3M filters do not contain fiberglass, they are a poly plastic, so these are relatively safe, but if you are not 100% sure AVOID HEPA filters

Blue shop towels are the most easily available and cheapest option.

Blue Shop Towels
Blue shop towels make excellent filters

 

Polypropylene interfacing is a highly recommended material for masks. Be sure to get the right kind, as not all are made with the optimal filter pattern. Please see the study below.

DIY_Mask_Testing_Bright_scaled-1024x683
DIY Mask Testing on commonly available materials.