Bought these filters to improve the suction power of my daughter's 9 year old vacuum cleaner. (It NEVER had new filters!) I thoroughly cleaned the entire vacuum and then installed new filters. It worked great at first, then the suction power dropped and the power cord got very hot. Turns out the vacuum itself probably wasn't worth recycling. However, this was not due to the filters. In fact, I was glad I tried it and still didn't spend a lot of money!