this is the most powerful range hood under 5" I could find. looks nice and is easy to install. don't give 5 stars for 2 reasons. 
1) there's no instruction and template in the package for installation. 
2) didn't feel 600cfm power at highest level. in theory，for a 20'x30'x8' kitchen，it should be able to suck out all air in 8 minutes