The Optrel 4088.101 is a pack of 50 genuine particle pre‑filters designed for the Optrel e3000/e3000X PAPR respirator system. These non-woven fabric filters are installed in the blower unit ahead of the main TH3 filter to capture larger dust and debris, effectively extending the life of the primary filter. Compact and easily replaceable, they are ideal for users working in environments with heavy particulate exposure, like welding and grinding, helping maintain optimal respiratory performance and reducing costs from premature filter replacement.