How To Determine What Size Fan & Filter You Will Need For Your Space
We recommend to change the air in your grow room once every 3 minutes or more. First you will need to calculate your cubic feet of your space. To do that, just multiply your rooms length, width and height. Once you get your cubic feet you want to divide that by 3. That will give you your starting point for sizing your fan. See below for example.
Example: Room Length (8) x Room Width (8) x Room Height (8) = 512 Cubic Feet. Divide 512 cubic feet by 3 to get your minimum recommended fan and filter combo. For this example you will want a fan that will is capable of exhausting 170 cubic feet per minute (CFM) or more. This will be the absolute minimum CFM for exchanging the air in an indoor garden. Remember that oversizing slightly is better than undersizing.
Other things to consider are: Will you have a carbon filter? If so add an additional 25% to your minimum CFM requirement. What type of lighting are you using? Add an additional 5% per air cooled light and about 10-15% per non air cooled light.
Filter Types - You can narrow your search by the type of filter needed for your grow room.
Exhaust Filters - are designed to be used on either end of your exhaust fan and will scrub the exhausted as it leaves your garden of any potential odor from your plants. These will only need to be replaced every12-18 months. Inline Filters - will also remove odor like standard exhaust filters do, but they have flanges on both ends of the filter allowing it to be used inline (with ducting attached to both sides). Air Box Filters - have a similar design to an inline filter, but these have replaceable carbon and pre-filters that need to be changed more often. Replacement Pre-Filters are the cloth like material that fits around your filter to help catch any large particulates that would otherwise be sucked through your filter. Replacing your pre-filter will help extend the life of your carbon filter.
Ducting Type - Insulated ducting will reduce noise from fans and will minimize heat transfer back into the grow room. Insulated ducting is recommended for air-cooled reflector or in high heat situations.
Supply Voltage - This refers to how much power is needed to use the device. 120 Volt is the standard supply voltage available in most homes. Unsure about what plug type you need or don't see a product in the certain voltage you are looking? Give us a call and we can check for availability and verify compatibility.
Inline Fan Features - Sound insulated walls help muffle the amount of noise the fan makes while running. Built-in speed controller means that you will be able to adjust how strong the exhaust of the fan is.