EnviTec's Bag In/Bag (BIBO) HEPA filter housings are containment systems that are designed to filter dangerous biological, carcinogenic or radioactive contaminants from air. Containment systems, as their name infers, are designed to contain the filtered contaminants in a sealed housing until such time as the filter media needs replacement. The EnviTec BIBO filter housing is a permanent housing designed to hold either gasket or gel seal filters.