Your base CFM is 1152 divided by three = 384. Let’s say you have a grow room that’s 12 feet by 12 feet, and 8 feet tall, which equals 1152 cubic feet. Here’s a grow room example so you can see this formula in action: Add 1% for every foot of duct tubing you use to connect your exhaust fan to the scrubber.If you use a carbon scrubber, add 20% to your CFM rating.For every 1000 watt of HID lighting, add 10% to your CFM rating.You want to exhaust all the air every three minutes, so divide your total cubic feet by three.Multiply the width and length of your grow room times the height to get the total cubic feet.So here’s how you calculate the CFM rating for your fan: Using a decibels meter with the major brands of exhaust fans sold at hydroponics stores, I’ve discovered the quietest brand of fan is the Hyper Fan Stealth. In most cases, the fan generates the most noise. Many growers add a silencer or muffler into the system to decrease noise. In most cases, you’ll need flex tubing material to connect your exhaust fan to the scrubber, and/or to connect the fan to its terminal exit, which is best in a soffit rather than cutting a hole in the roof to make a roof vent. To exchange grow room air, remove smell, and exhaust grow room air, at minimum you need an exhaust fan and scrubber. Unless you’re running a sealed grow room and/or adding carbon dioxide (C02), you want to remove all the air in your grow room every 3-5 minutes and replace it with fresh air. That’s why some of the most important marijuana grow room factors are air exchange, exhaust fan cfm (cubic feet per minute), and odor control. You need to send odorless air and heat out of your grow room so it dissipates outdoors. Your marijuana plants need fresh, clean grow room air.
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