Atomstack AP2 Replaceable Filter For D2 Air PurifierAtomstack AP2 Replaceable Filter Features: Atomstack maker D2 air purifier replacement element, a 3 layer filter element specially developed for laser cutting, which can effectively filter the odor and harmful substances generated by laser cutting, with a filtration rate of 99. 5% (atomstack laboratory test data). Contribute to environmental protection: Discharging the cutting waste gas directly into the atmosphere will cause more pollution, so use an