Description Excellent Odor Control: Made of premium RC 412 Australian Virgin charcoal at 1200 IAV, helps to eliminate pungent smells and chemicals; The 38mm thick charcoal bed with high microporosity ensures its high absorption Eliminates Smelliness: Protects from smelliness from pungent indoor grow operations to bathrooms, basements and kitchens. Absorbs smelliness from pets and smoking as well Effective Smelliness Control: Eliminate some of the most undesirable, pungent smell and particulates from indoor grow tent, hydroponics grow room Ducting Material: High-quality aluminum (High Temperature Resistant & Corrosion Resistant & Long Lasting); Clamps Material: Stainless steel (Rustproof & Corrosion Resistant & Heavy Duty). Ducting Feature: Three-layer Thickness (Aluminum Foil PET Aluminum Foil): Flame-retardant coating. Thermal Endurance: Temperature range from -22 to 266 Fahrenheit. VIVOSUN 4 Inch Air Carbon Filter Smellines Control and 4 Inch 8 Feet Non-Insulated Flex Air Aluminum Ducting