This filter is the right filter replacement for the AprilAire 201 air purification system. It fits perfectly in the air conditioning system. So this filter is great for that, and when you need it, it works great. My problem is the design of the whole system and how you set up the filter. The accordion design is a whimsical design. Combine that with long, forked plastic discs that you have to align at each filter bend, and you've got a recipe for irritation. It takes a few minutes to line up each fold with each fork, and if you accidentally miss one (which has happened at least 4 times) you'll have to redo everything from now on. This is a process, not an entertainment. I understand that they created an "upgrade" for the filter holder, so I might buy one. So far the filter has worked flawlessly.
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