Break fast
I use these filter retainers when we go trailer camping, to filter out the fumes from campsites that aren't just cooking their dinners. They fit fine but you have to remove them from the cartridge to swap out the prefilters, and they crack and fall apart readily. I'd rather pay more for a set that I can use multiple times. I ended up having to tape the filters on when two sets broke in three days on the road.
Rating: 2 stars