Airflowrequrements for 600W HPS Cooltube?

Hey!

I am currently using a 600w HPS during flowering and i am forced to have my wardrobedoor open with an oscillating fan outside to keep the temperature down.

What kind of airflow in m3/h would u recommend for a 600w HPS?

400cfm + canfan type

I would think a 6 inch inline would be enough if its being vented outside or in the roof etc. can't be vented into the same room or lose its just gonna stay hot no matter what