Ventilaider Precut for HPA300 Premium Carbon Activated Pre Filters 4 Pack Compatible with HW Air Purifier. Precision Fit for Easy Installation Advanced Filters

Received items well packaged in good condition as described. Have not used them yet, but hopefully, they are not like the previous order from a different manufacturer which were slightly too small which allows air to pass around the top and bottom of the filter. Would definitely purchase again if I don't have this problem. Thanks. P.S. In my opinion it would be better to have the pre-filters slightly oversized than undersized.

Have bought these 2 times and will be a continuing customer indefinitely. They are a perfect fit and do a great job, no different than original that came with the air purifier itself. Hope the price doesn't go up!!

These filters are identical to the one that came with my air purifier. Well pleased.

Working great. I bought the wrong size so just stuck on a filter I got from the store

Really good quality filters! Provided good air flow and was a great find, couldn't find many other ones in this specific size and quantity at this price point! Highly recommend!

They are fantastic, the price is fantastic. Work just as great as the name brand filters and are a fraction of the price. Going to order some more as we have 4 HPA300 air purifiers and I am afraid you are going to raise your price.

Had to cut down to fit.But easy to cutPrice was right so would purchase again .

Works great. Value pack is nice because we have lots of animals so we change it more often.