Review on Enhance Air Quality with FilterBuy 20X24X1 Pleated Furnace Filters for Superior Filtration by Marc Zitnik

For the price, these filters aren't exactly convincing; However, they are of average quality. They fit quite well, but they could be a bit bigger to go in the return and the filter slots are a bit narrower. The filter media definitely catches some dust and dander particles, but if you look at the air duct and main oven filter, a little funk through. I would be surprised if it was actually MERV 11. Overall I think this is indeed a 4 star filter. They're far from the best, but they're not the worst either, and they're reasonably priced when it comes to filter pricing.