Nanofibers are incredibly small fibers, each measuring three thousand times thinner than a human hair. Nanofiber can be applied to air filtration materials. Grand Max Nanofibers filters consist of a PET film and a nanofiber layer.

The spiderweb-like structures of nanofiber filter have great advantage over the conventional air filter, due to the large surface area and tiny pore size of nanofiber. Nanofiber filter can achieve high filtration efficiency at a low pressure drop.