If you have any questions, please contact us via message so we can assist you as soon as possible. 4/6/8 inch air carbon filter, 38mm thick, activated carbon, reversible flange, stainless steel, meets quality standards - 4 inch. Note: This product page only sells the 4-inch color. If you need other sizes/colors, please refer to the Questions & Description section. Made of 100% pure activated carbon, providing 100% filtered airflow. The 1050+ RC 48 carbon captures three times more airborne contaminants than average due to the optimal surface area per carbon particle. The carbon bed in our filters is 38mm thick and machine-packed with extremely small granules. It removes chemicals and odors, from spicy indoor growing operations to bathrooms, basements, and kitchens. It eliminates some of the most unwanted odors, acrid smells, and particles from indoor grow tents and hydroponic grow rooms. Including use with inline and duct fans, intake and exhaust fans, air exchange fans, ventilation ducts, and other accessories. Specification: Body Material: Stainless Steel. 4 inch: Diameter 100 mm/4 inch, Filter Length 200 mm/8 inch, Total Diameter 176 mm/7 inch. 6 inch: Diameter 150 mm/6 inch, Filter Length 300 mm/12 inch, Total Diameter 226 mm/8.9 inch. 8 inch: Diameter 200 mm/6 inch. 8 inch: Diameter 200 mm/12 inch. 8 inch: Filter Length 400 mm/16 inch, Total Diameter 276 mm/11 inch. Package Includes: 1x Air Carbon Filter. Q: About availability? A: The products shown are available. Q: About shipping cost and delivery time? A: All products have free shipping; you don't need to pay shipping costs or taxes. They are shipped from China and take approximately 15 to 25 days to arrive and be delivered. Q: Do you offer an invoice? A: We offer digital invoicing. You can message us after placing your order if you need it. However, this invoice does not function as a tax invoice and does not have a company seal. Our company, CNTRESBOTES, won the 2023 China Best Retailer award. Please rest assured that you will receive the goods with confidence. If there is a problem, please contact us immediately so we can resolve it!