Modello 3D di Filtro HEPA portatil para escuelas - Portable HEPA filter for schools, avoid COVID almost 2 years 20 Modello 3D di Lack Enclosure HEPA and VOCs Air Filter almost 2 years 17 Modello 3D di Nanohack mod (two filters + improvements) almost 2 years 15 Modello 3D di Coronavirus: Doctor!Doctor! - Portable HEPA Air Filter (Beta) almost 2 years 7