Do I Need Exhaust Or Intake For Grow Tent?

Whether you’re growing indoors or outdoors, there are a few different options for air intake or exhaust in your grow tent. You can use passive intraction, which doesn’t require any set-up, or an active indoor air intake that needs to be located near the bottom of the tent. You don’t even need to set up an exhaust fan, but it is recommended.

Passive intraction doesn’t need to be set up

Passive intraction is a powerful method of bringing natural light and air into your grow tent without needing to set it up yourself. Passive intraction works by creating positive and negative static pressure in an indoor space. This pressure creates a pulling force when a fan attempts to move air through it. Passive air input is similar to drinking through a straw: the exhaust fan (mouth) pulls the liquid through the straw.

Active indoor air intake needs to be located near the bottom of the grow tent

When considering an indoor air intake system, you need to consider whether you’ll need to use a passive or active model. Passive systems work by creating negative air pressure inside the tent, which is less than the air pressure outside. They’re a great option for smaller grow tents, but they’re not recommended for larger tents or high-temperature environments. An active indoor air intake system requires an extra fan at the base of the grow tent, which pulls air into the tent through an intake port. This method is only necessary when your exhaust fan is struggling to move air.

Passive indoor air intakes don’t require an intake fan. Intake fans can also generate light pollution, so you need to choose an intake fan that won’t generate excessive amounts of light. Make sure the intake hole is larger than the exhaust hole. The larger the intake hole, the less work the exhaust fan will have to do.

Humidity controllers

Humidity controllers for grow tents are important to keep your growing space at the right temperature and humidity level. Plants generally prefer a slightly humid environment to grow, and the ideal humidity range can vary depending on the growing stage. Humidity controllers can be purchased at almost any store.

Humidity controllers for grow tents can be used to keep humidity levels at a constant, or they can be programmed to monitor the temperature. There are two main types of grow room climate controllers, and both have their own benefits and disadvantages.


One of the best ways to get the air inside your grow tent is with ducting. The idea is to have clean air come in through an intake hole. In theory, the same idea applies to venting the grow tent. Ducting helps you get the air you need for growing cannabis in a controlled environment.

Ducting is a flexible tube that clamps onto a fan or filter. The ducting moves the air into and out of your grow tent and can be attached to an open window. This helps you keep the grow tent from overheating. Most ducting packages come with clamps, so you can attach it easily to your grow tent.

Fan controllers

If you’re trying to keep the air in your marijuana grow tent quiet, you’ll need fan controllers. These devices help regulate air flow by sensing temperature changes and adjusting the speed accordingly. The best controllers can run at up to 3 AMPs, which is plenty for most growers.

These controllers control the fan speed and power supply. This way, you can set the temperature and air flow without a lot of work. This will also allow you to control the airflow while your lights are off. Some of these devices have photocells that will sync up with your lights’ schedule and reduce the fan speed when the lights are off. This way, you can grow marijuana plants at the proper temperature and maximize yields.

Light-proof air intake

One of the easiest ways to keep light from escaping your grow tent is to use a light-proof air intake. A simple cone-shaped filter is ideal. Another light-proof option is an old carbon filter. You can buy these at a hydro store but they’re expensive.

During the vegetative stage, light-proofing your grow tent isn’t necessary. However, during the flowering stage, you’ll need at least twelve hours of darkness each day. A light-proof vent can be made from fabric and taped to the top or sides of your tent’s intake screens.