Shurex offers a 12 pack of activated carbon filter replacement refills for the KOTTO solder smoke absorber. These filters are compatible with a DIY fume extractor that has a 4.7"*4.7" fan unit. They are designed to eliminate toxic fumes and neutralize odors. The filters are effective in filtering flux smoke and can be used for soldering, electric iron welding, and 3D printing. Each pack includes 12 replacement cartridges, providing a long-lasting and cost-effective solution for fume extraction. The filters are made from high-quality activated carbon and effectively capture and remove harmful fumes, odors, and particles from the air. Each filter is individually sealed to maintain its adsorption capacity.