• Nispira premium activated charcoal pre filter compatible with Whirlpool part 817600. It fits WPT60 Series WPT60P, WPT60B  Whispure Medium Tower Air Purifier. 
• Activated charcoal pre filter help removing the unfavorable household smell such as smoke, cooking, pet smell, VOCs chemical etc. It also helps to extend HEPA filter life span by capturing the large particle in air such as hair, dust, debris etc. 
• 8 filters included. Dimension approx: 6.9 x 11.6 x 0.1 inches. Suggest to replace every 3 months to optimize the performanace.