Hepa filter for 3M masks

thingiverse

I engineered this case to utilize readily available HEPA filters specifically designed for vacuum cleaners. It's compatible with 3M respirators. The main filter is situated underneath the ventilation grill, and below it lies a secondary filter crafted from standard vacuum cleaner HEPA bags. This second filter was trimmed to perfectly cover the area of the bottom surface of the case. Six supports securely hold the second filter against the first one, ensuring optimal airflow. The top case completely encloses the sides of the bottom case. CAUTION: Due to a lack of proper testing and certification, this filter is not recommended for use. The vacuum filters employed in its construction were unlicensed generic HEPA filters, sold without any official endorsement. This makeshift filter should only be used as a last resort when other options are unavailable.