PuraVita Medical 510K Certified KN95 ASTM Level 3 Mask, Made in USA, BFE/PFE ≥ 98%, 20/Box. PuraVita's in-house testing center batch tests materials to ensure they consistently exceed ASTM level 3 requirements for all KN95s manufactured in their Utah facility. Due to COVID-19, face mask orders are NON-RETURNABLE.