This catalog presents a multi-layered Photocatalytic Filter for Air Supply, engineered to purify air by eliminating viruses, toxins, bacteria, and odors. The system integrates a Slim Photocatalytic Filter and a standard Photocatalytic Filter, which initiate oxidative decomposition (酸化分解) of pollutants under natural light. A subsequent Carbon Filter provides adsorption. The final stage features an Indoor-Light Photocatalytic Filter, extending the oxidative breakdown under indoor illumination. This advanced process converts contaminants into harmless H2O and CO2 via reactive oxygen species (OH radicals, O2- ions), ensuring comprehensive air purification for various applications.