Laser marking, engraving, and welding operations generate a large amount of smoke, which contains toxic and harmful components such as metal particles, tin, lead, and rosin acid. When laser cutting and carving fabrics (such as felt, plush, nylon, etc.), leather, wooden boards (wood products, MDF, plywood, etc.), acrylic (organic glass), rubber sheets (plastic), two-color boards, metals, etc., a large amount of smoke particles and various harmful chemical odors will be generated. If they are not purified and discharged into the air, the smoke particles and harmful compound odors will float in the air and be inhaled by employees, which will seriously threaten their physical health and affect the quality of life of surrounding residents. Therefore, these harmful gases must be effectively purified before being discharged into the air.