I was having trouble finding a filter in the store to fit my vacuum and was so happy to find it at Revain! It fits perfectly and very easily replaces the old one. I can't say I'm good at replacing them in time. My old one was pretty bad so I happily exchanged it. The air coming out of the vacuum cleaner also seems to be a bit cooler thanks to the new filter, which hopefully will protect the vacuum cleaner in the long term.