Product review (1 stars): wrong item description when I bought
When I bought it at 2015, it listed as 900 CFM in the title. But after it was installed by professionals, I found it definitely not a 900 CFM one after testing with paper and a thin book. But the installation was expensive. So, I gave up to uninstall and return. Now I noticed that the title changed and the description says it is 500 CFM. I knew I was cheated. Also as other posts mentioned, its filter is hard to clean.