DTaroanswered grow question 4 years ago Hello Luna91,
I recently read about 6/2 light cycle during veg posted in maximum yield, if you are running into heat stress you could try that to help dropping the temperature from the lights, and try keeping the vent ducts line straight, every bend drops 5% extraction efficiency.
The fan will work but I'm not too sure about sizing a fan for your grow room. I'll leave someone else to answer that.