Polyurethane Foam Fan Filter Media
Available in 30, 45, 60 & 100 ppi (pores per inch) to fit 40mm, 60mm, 80mm, 92mm, 120mm & 162mm fans. Manufactured by GardTec Inc., Fan Filter Media helps diminish the possibility of dust related PC issues, such as overheating, system failure, and permanent data loss. Fan Filter Media prevents dust from entering an electronic component without an increase in temperature.
Shop cabinet cooling fan kits to get fan filter media, a plastic fan guard and a cooling fan in one