upgrading exhaust fan need help

[groder97]

okey i need to upgrade my exhaust fan. i currently have a active air 309cfm fan and am needing to go bigger. so i saw the active air 400cfm fan and the canfan 6' ho ( highoutput) 440cfm. what iam asking is will that 40cfm diffent really going to show. i also have a Can33 on the end to the exhaust

 

[stupid]

okey i need to upgrade my exhaust fan. i currently have a active air 309cfm fan and am needing to go bigger. so i saw the active air 400cfm fan and the canfan 6' ho ( highoutput) 440cfm. what iam asking is will that 40cfm diffent really going to show. i also have a Can33 on the end to the exhaust

I have the same fan for my grolab 80. If thats not enough fan for you i would think the 440 would be too. I would go with the 556 cfm 8 inch active air . If you have all 6in ducting, get this
http://www.77hydrostore.com/env180.html