4 Carbon Pre Filters, Fits Whirlpool AP300, AP350, AP450 & AP510, Part # 8171434K
Very pleased with this filter - it may be BETTER than the Kenmore brand I had been using!
My first order from Crucial Air (along with the HEPA filter also)- Just arrived and installed a few minutes ago. Perfect fit - the slits to align the filter WERE there in my filters, made for easy install. Comparing to the old installed filter (brand name of KENMORE - which was made by Whirlpool and rebranded for Sears) to the Crucial one - the Crucial filter seemed to be noticeably MORE substantial than the Kenmore-branded one. So far so good! Happiness!
Great price as good as one filter,would buy again and the price point is where it should be. If you need replacements buy these!
Good service, good price.
Good filters, price and service. Feel free to order from this company