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Why Do Marijuana Grow Rooms Need Fans?

Keep the Air Moving For Your Plants

If you are new to growing marijuana, or have been trying to grow it, but have been unsuccessful, this article is for you. Proper Air circulation in marijuana grow rooms is an important part of the process. If there is improper circulation, your plant growth may stunt, you may have weak branches which won’t hold the weight of heavy buds, and you might end up with a mildew or bug problem. All of these issues can be combated with the right size fans, placed appropriately.

How Plants Grow

Marijuana plants, like all plants, thrive off of carbon dioxide (CO2). The carbon dioxide that is in the air is absorbed by plants and it helps them to grow thick and strong. Without enough CO2, plants will not thrive; staying limp or brittle. Picture an elderly man with oxygen and then take the oxygen away, he will not function as well. That is your marijuana plant without adequate CO2; a frail old man.

Air circulation is important to ensure that fresh air is being brought into your growing room or tent. If the air is still, it gets stagnant and it will also be void of crucial CO2 which will make your plants suffer.

To ensure that your plants stay strong, make sure that you are bringing fresh air in with proper ventilation and air circulation.

How Air Circulation Benefits Your Plants

Marijuana that is grown outside grows big and strong because it gets plenty of air. Again, air has CO2 and that helps the plant to thrive.  

When growing outside is not an option, and you are using a grow tent, you need to recreate the outdoors with lights and fresh air. While lights are a discussion for another time, fresh air can be vented in and circulated with fans.

The best way to see that your plants are getting the right amount of air is that they should gently rustle. Think about the way the leaves on a tree blow in the breeze. This is what you want. It is especially important in the canopy or the tops of the plants. Anything more, and it can be damaging to the plant, anything less, and they aren’t getting the proper amount of CO2 exchange.

Additionally, plants need proper air at the base. This will ensure that the plants don’t stay damp for too long, getting mildewed or moldy. It also keeps bugs away. Incorporating fans that will hit the lower parts of your plants is just as important as fans that circulate air and rustle the canopy.

Types of Fans

Fans come in a vast variety of types and sizes. Depending on the size of the tent you have, and the type of fan you are using will determine how many fans you will need.

Ceiling Fan

In most scenarios, one ceiling fan should suffice, for a beginner’s tent. You might want something fancy like this.

Honeywell Ceiling Fans Carmel, 48 Inch Contemporary Indoor LED Ceiling Fan with Light, Remote Control, Dual Mounting Options, Dual Finish Blades, Reversible Motor - 50197-01 (Bronze)
  • Keep Cool With The Correct Ceiling Fan Size — For ultimate performance, choose the best ceiling fan size for your room; This 48-in indoor ceiling fan is ideal for smaller areas up to 100 sq. ft. such as bedrooms, kitchens, & other small spaces
  • Modern Blades to Suit Your Home — This Carmel 5-blade room fan provides ultimate airflow; These fan blades deliver maximum circulation at high speed; Blades have a bold body & dual-finish wood finish options
  • Dual-Mount Hanging Options — A multi-position fan with 2 hanging options; Standard option offers a 4-in downrod (included); Angle option allows for hanging on vaulted ceilings with a longer downrod (sold separately)
  • Crafted With High-Quality Material — The high-capacity motor delivers powerful airflow & quiet performance for years to come; This durable & modern ceiling fan is designed for long lasting comfort; ETL listed
  • Reversible Fan For All Seasons — Improves air circulation in winter & summer; During summer, this ceiling fan optimizes airflow to enhance comfort; During winter, change the direction to evenly distribute warm air on low speed
  • A Ceiling Fan For Indoor Rooms —This room fan is perfect for your living room, kitchen, bedrooms, or dens where increased airflow can make a room more comfortable
  • Remote Control Convenience — Control your Honeywell ceiling fan with the touch of a button; Adjust fan speed & light from the convenience of the remote control (batteries included); Comes with wall mount to hold your remote, for easy access
  • Ceiling Fan With Light — Control your fan light with the remote control; Easily turn the light on or off from anywhere in the room; LED bulbs (included) are energy-efficient & longer lasting; Dimmable from 20% to 100%
  • Modern Dual-Finish Blades — This fan will suit a contemporary style home & comes with a different finish on each side of the blades; Choose between Cimmeron & Ironwood; Pick the finish that best fits your space
  • Honeywell Ceiling Fans Customer Promise — As a superior quality ceiling fan, the manufacturer offers a limited lifetime warranty; Honeywell ceiling fans come with easy-to-follow instructions
  However this can be a problem to install when you need a light fitted above the plants

Oscillating Stand Fan

Oscillating fans are great and more convenient because they can re-direct the air over multiple plants. Also, because you can adjust the height, you can direct them to hit both the canopy and the base of the plants at the same time.

Oscillating fans come in sizes ranging from 8” to 30.”

Lasko Wind Machine Air Circulator Floor Fan, 3 Speeds, Pivoting Head for Large Spaces, 20", 3300, White
  • ✅【3 SPEEDS 】The Lasko Wind Machine Fan features 3 high performance speeds that will keep you cool day and night
  • ✅【PIVOTING FAN HEAD 】The fan head pivots to direct the powerful airflow up, down or anywhere in between
  • ✅【BUILT TO LAST 】The Wind Machine Air Circulator Fan from Lasko features a rugged design and construction making sure it will last for years to come
  • ✅【IDEAL FOR LARGE SPACES 】This floor fan is great for circulating air conditioning, exhausting stale air, and bringing in fresh air in large spaces in the home. The convenient carry handle makes it easy to move this fan from room to room
  • ✅【TRUSTED FOR GENERATIONS 】Lasko has been a trusted maker of quality home environment products for over 100 years. Built to last and made from domestic & imported parts. ETL listed. Comes with Lasko’s trusted 2-pronged blue plug safety fuse technology

Tower Fans

Tower fans are another ideal option because they move the air efficiently and eliminate any unnecessary noise. The tower design allows air to be more efficiently distributed throughout the room.

Lasko Oscillating Tower Fan, Remote Control, Timer, 3 Quiet Speeds, for Bedroom, Living Room and Office, 42", Silver, T42951
  • ✅【POWER YOU CAN FEEL】The 42" Wind Curve Tower Fan has 3-speeds to keep you cool all day and night. This tower fan is perfect for large rooms and bedrooms. The remote control features 5 buttons: on/off, timer, speed, oscillation, and nighttime setting
  • ✅【BLADELESS DESIGN】With a slim, sturdy, bladeless design, the 42" Lasko Wind Curve Tower Fan fits beautifully into your home and provides cooling comfort. This lightweight fan is easy to assemble, and the carry handle makes it simple to pick up and move
  • ✅【OPTIMAL OSCILLATION】While other fans promote a full 90 degrees oscillation, we designed the 42" Lasko Wind Curve Tower Fan with 60 degrees of oscillation to ensure you feel more of the breeze so you're not waiting longer for the fan to come back around
  • ✅【TIMER + QUIET NIGHTTIME MODE】The 42" Lasko Wind Curve Tower Fan has a 7.5-hour timer for easy on/off through the day or night. The quiet nighttime setting automatically dims the LED controls and decreases speed so you can sleep peacefully and stay cool
  • ✅【DESIGNED IN THE USA】Designed and engineered in the USA and backed by our 1-year manufacturer’s warranty, Lasko has more than 115 years of American design and manufacturing experience building high-quality, ETL listed, safe and reliable fans.

Clip on Fans

Clip on fans are also great for smaller tents. If you have a larger set up, several clip-on fans would be beneficial. They have a similar effect as oscillating fans; they can be redirected to hit the most plants possible.  Here is a rechargeable model.

KEYNICE Clip on Fan, Large Capacity Rechargeable Battery Operated Desk Fan, Auto Oscillating Fan with 3 Speeds and Intermittent Wind Setting, Mini Cooling Fan for Stroller Office Home Outdoor Activities
  • 【Oscillating Function & 3 Speeds Adjustable】 It can automatically rotate about 50° left and right, can manually rotate 50° up and down and 180° to left and 90° to right. 3 speeds adjustable and also has a natural wind speed (The fan is working intermittently in this speed).
  • 【Clip & Desktop & Wall Mounted Use】 Clip design, so it can be clip on anywhere, flat design, so it can put on any flat place, and with a hole below, it can mount on the wall. Suitable for a variety of life scenarios such as home office camping.
  • 【Quiet & Portable】 The sound of maximum speed is about 20dB, it’s quiet without disturbing you. Its size is 16.3*14.5*25.5cm, and it can be charged by any USB power, so you can bring it to anywhere to use.
  • 【Rechargeable Battery & Easy Clean】Built-in 2*2500 rechargeable batteries, it can work about 5-28 hours after 8 hours charge( depend on the wind speed). The fan front cover is detachable, which is easy to clean.
  • 【High Quality & Safety & Warranty】With high quality material and fine mesh cover and 12 months warranty, you can order and use it with confidence. If the product has any quality problems that are not Man-made damage during the warranty period, we will give satisfied solution.

How to Safely Install a Tent Fan

Always use a GFCI outlet. When you have fans running in an area where water is being used or sprayed, having a safety outlet is important. This monster is for someone with power surges and a number of lights and fans to connect.  Power surge protectors like this can prevent damage to your LED Grow Lights.

Tripp Lite PV3000GFCI Heavy Duty Inverter 3000W 12V DC to AC 120V 5-15R GFCI 4 Outlet
  • PowerVerter Ultra-Compact Inverter, portable power for all applications
  • 3000 watts continuous output power; up to 6000 watts instantaneous power
  • 4 shock-protected GFCI AC outlets; rugged all-metal housing
  • Automatic shutdown feature prevents battery drain
  • 1-year warranty

Also, take care to where you hang or place the fan. If water is being sprayed above them, it can get into the blade area and burn out the motor.

Air circulation is extremely important to growing a strong and healthy crop. If you have good air, your plants will get the necessary CO2 and flourish. This will produce a strong plant with strong branches that can support buds. And mildew will not be as much of a problem.

Make sure you also read MaryJane Farmer’s larger article about the best in-line fans for grow rooms.

Last update on 2023-02-20 / Affiliate links / Images from Amazon Product Advertising API

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