Which one is better for a large shower room? How much is the large shower room? Direct sales? Kelsen supply Suzhou Kelsen Air Filtration System Co., Ltd. was established in 2006, focusing on the design, R&D and manufacturing of various air purification equipment for more than ten years, which is at the level of * * in the industry. Main products include laminar flow system, sterile isolation system, biosafety control system, etc., and can meet the requirements of OE