Dirt Devil CV1500 HEPA Replacement Bags. The Dirt Devil CV1500 features HEPA filter bags. The term HEPA (high-efficiency particulate air) describes filters designed to capture 99.97 percent of all particles 0.3 microns or smaller (too small to see, but the perfect size to penetrate your lungs). This size covers all common allergens, from mold and animal dander to dust mites and pollen, along with some small particles from smoke and pollution. Dirt Devil CV1500 HEPA Replaceable Filter Bags, Package of 3.