AAF's products are mainly filtered by filter carriers, which are divided into first-class nylon mesh (to filter larger pollution particles and protect the efficient life of the lower layer) and second-class chemical granular carbon patented by AAF, which has a very good adsorption effect on harmful gases such as formaldehyde, reaching 98.5%. The third layer is HEPA high-efficiency filter, and the bactericidal effect reaches 99.99% by adding synthetic bacteriostatic agent. There are purple lights on the fourth and fifth floors.