dr120 setup ???

ok i have a DR120 on its way, i allready have my 400HPS with a Eruo cooled hood
now im wondering about fans and filters and how i should hook everything up in it

size of fan and filter???
4 inch / 6 inch

i seen on greners site they have a place to calculate the size and it says 180 cfm

will this be enough to cool my light also if i run from filter to light than out

pictures would be nice on how to set this up and info thanks

You're going to want more than 180cfm for that 400w IMO. I'm running 600w in a DR120W and use a 6" fan rated at 430cfm + Cool tube + Phresh Filter

Good luck, you should have no trouble keeping 400w at good temps in that tent, just make sure you have good air cirulation