I have a 4' x 4' x 7' grow tent with a 600 watt hps/mh growlight. Will the Inline fan below do the Job for me GrowBright 4" High Velocity Inline Fan High Tech Garden Supply
4" Inline should cool a 600W without any problems assuming everything is setup correctly, see Ventilation FAQ for a quick rundown.
Thanks Bohbo im a complete new grower. What type of ducting should I get for a 4" inline fan. And also what temps do you think the inline fan will have my 4' x 4' x 7' mylar tent 600watt hps light
See bottom of FAQ for ducting info. I would say probably 5-8 degrees above ambient temps is pretty safe.