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Velvet Digest

Do I need a fan for my grow?

Author

Mia Phillips

Updated on June 13, 2026

Fans have an extremely important part to play though, as air flow depends on them. If you have a humid grow, we recommend having the fan on constantly, and for dry areas 15 minute cycles are much better. Although fans can be extremely helpful in some areas, they do have some downsides.

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Subsequently, one may also ask, do I need a fan in my Grow Tent?

Setting up oscillating fans will help moderate the temperature and humidity in your grow room, but fans alone are not enough. You need an air extractor fan system to keep the air in your grow room or grow tent fresh.

Subsequently, question is, do fans help plants grow? A fan can be of great help to any plant that is planted indoors as it circulates the air and prevents the dampness on plants and condensation. You can use floor fan, ceiling fan or oscillating fan as per the requirement. A Tip: Do not position the fan directly on plants.

Beside this, do indoor plants need a fan?

Houseplants and plants in greenhouses or under lights will need airflow even more than outdoor plants. If your plants are near a window, they may get all the circulation they need. Even if the window is kept closed, the fluctuation in temperature will cause a slight breeze. However, your best bet is to use a fan.

What size fan do I need for my grow tent?

The proper size fan for a 4x4 grow tent: Most 4x4 tents measure 48in x 48 in x 80 in. So the total volume of air in a 4x4 grow tent is 4ft (length) x 4ft (width) x 6.667ft (height) = 106.67 cubic feet. But that doesn't mean you need a 106 cfm fan.

Related Question Answers

How long should a fan be on in a grow room?

You can have them on constantly or on 15 minute cycles. If you have a humid grow, we recommend having the fan on constantly, and for dry areas 15 minute cycles are much better. Although fans can be extremely helpful in some areas, they do have some downsides.

How many fans should a grow room have?

8” fans are usually used for more high-powered grows. Here's a short equation to help you determine what CFM rating you need for your fan in your space. Determine the cubic area of your space by multiplying Length x Width x Height. You want to exhaust this amount of air at least once a minute.

How do you set up a grow room?

Ultimate Guide To Setup Your Grow Room
  1. Step 1 – Find Grow Room Space.
  2. Step 2 – Clean Designated Grow Room Space.
  3. Step 3 – Build the Grow Room.
  4. Step 4 – Ensure Fresh Air Circulation For Grow Room.
  5. Step 5 – Have Water Source Available To Grow Room.
  6. Step 6 – Grow Room Flooring.
  7. Step 7 – Installing Grow Rooms Lights.

Where do you vent a hot air from a grow room?

Your intake fan or vents should be at the bottom of your tent. Your extractor fan should be high, towards the back of your grow room, on the opposite side of your tent to yout intake fan or vent.

How often should air be exchanged in grow room?

5 minutes

Should I leave my fan on when lights are off?

Fans keep the air flowing, and that keeps the temperature under control. Lack of regular air exchange through fans will increase the temperature inside, and that would be even worse due to the radiant heat from the lights(even when they are off).

Can I leave my grow tent open?

Theoretically, yes, you can keep it open. But the whole reason I grow in a tent is to be able to control most if not all of the variables. You're opening up your plants to everything that is in that room.

Is fresh air good for plants?

Air Above Ground Stagnant air may be low on vital gases such as oxygen and high on other gases that may harm the plant. For example, when plants are placed indoors, fresh air is depleted over time and can cause the build-up of toxic gases.

Do plants need clean air?

An indoor plant's ability to remove these harmful compounds from the air is an example of phytoremediation, which is the use of any plant — indoors or out — to mitigate pollution in air, soil or water. Indoor plants remove pollutants from the air by absorbing these gases through their leaves and roots.

Do indoor plants like fresh air?

Later research has found that soil microorganisms in potted plants also play a part in cleaning indoor air. Based on this research, some scientists say house plants are effective natural air purifiers. And the bigger and leafier the plant, the better.

Do you need a fan for a grow tent?

In a grow tent, it's ideal to have at least two medium-sized fans so that the air will really have a good circulation in your grow tent. You can just place one fan above your plants and another on the ground.

What air do plants need?

Just like you, plants need air to stay alive. Plant leaves use carbon dioxide from the air to make sugars and starches for the plant to use as food. Another plant part that needs air is the roots. Plant roots need oxygen to stay healthy and to do their job of gathering water and nutrients for the plant.

Are plants in bedrooms good for you?

Plants to Help You Sleep Installing bedroom plants can certainly help improve the quality of your night's rest, because you can get plenty of fresh, clean oxygen that helps soothe and reduce anxiety and stress levels.

Do seedlings need a fan?

A fan helps ensure good air circulation around seedlings. The goal is to create a gentle breeze; don't point the fan directly at your seedlings. Keep the fan running 24 hours a day. In addtion to helping prevent disease, the constant air movement will help develop stronger, sturdier seedlings.

Are spider plants good for your health?

One of the easiest indoor plants to maintain, the Spider Plant produces oxygen whilst purifying the air in your home and office by absorbing carbon monoxide, formaldehyde and xylene. Additionally, Spider Plants are non-toxic and are in fact edible, making them safe for pets and young children.

Why do my plants keep growing mold?

Mold can be caused by a number of things including poor maintenance, over-watering, or lack of sunlight. Mold growing on the houseplants' soil or on the actual leaves of the plant is both harmful for the members of the household and for the plants. Luckily, there are ways of getting rid of this mold.

Do I need fresh air in my grow room?

YOUR GROW ROOM NEEDS AIR CIRCULATION The reason for ventilating a grow room is simple; cannabis plants need fresh air. Therefore, every grow-op requires air exchange. That means cool, fresh air in, and stale, hot air out. Too many growers get ventilation wrong and encounter all kinds of problems later in the grow.

Should I run my carbon filter 24 7?

You should run your carbon filter 24-hours a day and change it every nine to twelve months. Remember, carbon filters don't work in high humidity environments so try not to let your relative humidity rise above 70%. For best results connect your extraction fan to a fan speed controller.

How is sunlight used by plants?

Plants use a process called photosynthesis to make food. During photosynthesis, plants trap light energy with their leaves. Plants use the energy of the sun to change water and carbon dioxide into a sugar called glucose. Glucose is used by plants for energy and to make other substances like cellulose and starch.