Home Revolution Replacement Carbon Pre Filter, Fits Essick 447400HB, 4DTS 300, 4DTS 900, 696400HB, 696800, H12 300HB, H12 400HB, H12 600 Air Purifier and Part # 1051. Designed to fit: Essick 447400HB, 4DTS 300, 4DTS 900, 696400HB, 696800, H12 300HB, H12 400HB, H12 600 air purifier models, compare to Essick part # 1051. Replace with confidence: We back all of our products with a 100% satisfaction guarantee Breathe easy: Carbon pre filter removes even the smallest particles of allergens, impurities, and odors from the air and refreshes your home The Home Revolution Mantra: High-quality replacement products at a low price What you get: 1 carbon air purifier pre-filters