Air exchanged every 5 minutes is sufficient.

You are going to want to run two fans, one for the lights alone in a closed loop and one for the room to exchange the air and to deal with odor. Agree that an ozone solution is the way to go in this situation. Just be sure it vents external to the building.

Again, check my signature for a link to calculating your fan needs. It is best to account for the variables and do a proper workup.
bigsby Reviewed by bigsby on . Some Questions about my newest project. OK, so I'm looking at working with a grow room that measures 8ft x 14ft or 112 ft. sq. Hypothetically, with 32-36 girls in it. So, according to posts I've read, some people use a 50w per square foot ratio for HID lights, and some use a 62w per square foot ratio. By these two numbers that's 5600-6944w of HID lights. Does this sound reasonable? Accurate? Could I get away with less without greatly reducing yield? Moving on to airflow and odor control. The plan is to buy a large air purifier, Rating: 5