Filtro HEPA portatil para escuelas - Portable HEPA filter for schools, avoid COVID 3D-model almost 2 years 20 Lack Enclosure HEPA and VOCs Air Filter 3D-model almost 2 years 16 Nanohack mod (two filters + improvements) 3D-model almost 2 years 15 Coronavirus: Doctor!Doctor! - Portable HEPA Air Filter (Beta) 3D-model almost 2 years 7