Shurex offers a 12 pack of activated carbon filter replacement refills for the KOTTO solder smoke absorber. These filters are compatible with DIY fume extractors that have a 4.7"*4.7" fan unit. They are designed to eliminate toxic fumes and neutralize odors. In addition to filtering flux smoke, these filters can be used for soldering, electric iron welding, and 3D printing extraction. Each package includes 12 replacement cartridges made from high-quality activated carbon. These filters effectively capture and remove harmful fumes, odors, and particles from the air, ensuring a safe and comfortable working environment. Furthermore, each product is individually sealed to maintain its adsorption capacity.