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Package contains 30 square feet of 100% Polypropylene air filtration material to use for DIY Air Filtration projects or custom size air filters. The material exceeds HEPA H-11's efficiency on 0.3um particles. The material can be cut to your desired shape and length. Textured ridges-side faces incoming airflow. The material is 100% melt-blown polypropylene non-woven fabric enhanced with an electrostatic charge. Contains no fiberglass and no polycarbonate. Each production run is tested on particles ranging from 0.3 um to 10.0 um. All production efficiency exceeds 99% on 0.3 um particulate matter, and exceeds 99.9% efficiency on 3.0 um particulate matter. Tested at ~32 L/min airflow.