Cube filters from Grainger work in 100% humidity, are self-gasketing, and have three polyester filter layers, making them superb for removing heavy dust from an industrial ventilation system. They meet UL class 2 standards for flammability. For less demanding applications, consider a pleated filter or remove volatile chemicals as well as particulates by installing a separate carbon filter. You can also build your own air filter package with filter frame kits and rolls of filter media. Whatever your choice, find the cube filters, accessories and materials you need at Grainger.