How much airflow do cannabis plants need?
For a grow tent of this size, you’ll want to pick an exhaust fan with at least 40 CFM. As a general room of thumb, we recommend picking a fan with a CFM equal to the volume of your tent/room. This will ensure your fan completely replaces the air in your grow space every minute.
How do you calculate CFM for a grow room?
To calculate multiply length x width x height of growing area e.g. A room that is 8′ x 8′ x 8′ will have a volume of 512 cubic feet. Your extraction fan should be able to adequately exchange the air in an indoor garden once every three minutes. Therefore, 512 cubic feet / 3 minutes = 171 CFM.
How many BTUs does a cannabis plant produce?
Traditionally an open-hood 1000-watt HPS lamp emits upwards of 3,800 BTUs of heat, but a vented hood should reduce that number by about 50 percent.
Does cannabis need airflow?
Focus on Air Flow in the Grow Room As your design or renovate your indoor grow space, take care while planning the ventilation system. All plants, not just cannabis, needs the free movement of air to encourage growth, prevent disease, and to avoid infestation.
Do cannabis seedlings need wind?
Once you plant a young seedling outdoors, everything changes. Now, the plant must keep itself protected from direct sunlight and strong winds. It now needs a waxy leaf cuticle to keep water loss to a minimum.
How do you calculate air flow in a grow tent?
To get the CFM of your fan, use the dimensions of the Grow area. Multiply the height, width and length of the tent to get the total volume. The total volume of the tent should be the same as the CFM of your fan. Note that most fans are measured in Cubic Feet Per Minute (CFM).
How much CFM is needed for a room?
One cfm is needed per square foot (1 cfm/sq ft) of floor area. This is the average air quantity required for a room or an entire building.
How much airflow does a grow tent need?
To calculate the CFM you need to properly ventilate your grow space, use the following formula: (Grow Space Width X Length X Height) / 5 = Recommended CFM.
How to calculate the CFM of a marijuana fan?
So here’s how you calculate the CFM rating for your fan: Multiply the width and length of your grow room times the height to get the total cubic feet. You want to exhaust all the air every three minutes, so divide your total cubic feet by three.
How to calculate the CFM of a grow room?
Multiply the width and length of your grow room times the height to get the total cubic feet. You want to exhaust all the air every three minutes, so divide your total cubic feet by three. For every 1000 watt of HID lighting, add 10% to your CFM rating.
How many feet of tubing does it take to make one CFM?
You’ll use four feet of insulated tubing to connect the scrubber to the ceiling-mounted exhaust fan, and another foot to take the exhaust air out the soffit. So that’s five total feet at 1% added CFM per foot, so that’s 5% of 384 = 19.
How to calculate the CFM of a HID bulb?
Your base CFM is 1152 divided by three = 384. You’re running two 1000-watt HIDs, so add 10% each. That’s 20% of 384 = 77 added CFM. If you’re running double-ended HID bulbs, which tend to be hotter than regular HPS, you might add 14% each instead of 10%.