For plants growing indoors, ventilation is just as important as sunlight and water.  Good, constant airflow promotes healthy growth while discouraging the mold and stagnation problems often found in humid indoor gardens. Our experts are ready to help you select your air circulation system from our in-stock inventory.

Benefits of Proper Ventilation

  • Prevent stale air
  • Bring in carbon dioxide
  • Regulate heat and humidity
  • Control dust and mold
  • Reduce odor

When setting up your fan system, make sure the air is moving in every corner of your space. Oscillating fans work well for that purpose. Some people like to set up a sort of whirlpool arrangement, with the fans on one side of their greenhouse blowing in one direction and the fans on the other side blowing in the opposite direction, resulting in circular air movement. Adding an in-line fan to your system is also a great option to help push out old air; some in-line fans even have carbon filters to reduce particulate matters, including mold.


CFM is the acronym for cubic feet per minute – the measure of air volume moved by the fan. Choose a fan with a CFM rating appropriate for your room size and application to ensure adequate airflow. There are several factors to consider when determining which fan will be best for you, including ambient outdoor temperature; whether you intend to use a CO2 generator, dehumidifier, and/or air conditioner; whether or not your reflectors are air-cooled; and more. You will also want to evaluate your individual application for using an inline fan. Ask our staff in Cave Junction, Murphy, or Merlin for help with choosing the right fan! Because there are so many variables to consider, you can also talk to a representative at Hurricane for more information.

Why should I use an oscillating fan in my grow space?

An oscillating fan will help to keep the area cool and help the dew point in your greenhouse to fluctuate. A stagnant dew point is the main catalyst for the growth of powdery mildew, and changing your dew point with an oscillating fan thereby reduces the risk of powdery mildew.

Oscillating fans will also control the humidity on your plants. Ultimately, air movement across the plant will reduce the leaf surface temperatures. When leaf surface temperatures exceed 75°F, the plant enters a protection mode and begins to compensate for perceived drought. When a plant is in this mode, it does not take in required nutrients or water because it is preserving energy. Circulating air will help eliminate higher leaf surface temperatures and will keep your plant in optimum nutrient uptake mode.

How do I control Hurricane Fans?

Each Hurricane fan is unique in its individual controls. The controls for Hurricane Classic and Supreme wall mount fans, floor fans, stand fans, and clip fans are located on the units and are simple to use. The Hurricane Super 8 Fan can be programmed and operated with the buttons on the control panel, or with the included remote control. For Hurricane Centrifugal Inline Fans and the After Burner Mixed Flow Fans, we recommend using Titan Controls Fan Speed & Ventilation Controllers.

What is an inline fan used for?

An inline fan is designed for use in ventilation systems to boost airflow. They mount directly into your ducting system to create efficient and quiet air movement for either supplying air to an area or exhausting air from an area. Hurricane Inline Fans are also designed to work in conjunction with Phresh Filters and can be used to air-cool reflectors used in hydroponic applications.

Can I exhaust my fan into my attic or garage?

No. Never exhaust your fan into an enclosed space. Doing so will cause humidity buildup, which is a surefire recipe for mildew. The space will trap the heat that’s being vented, too, especially if your lights give off a lot of warmth. Also, the space will eventually accumulate all the particulates your fans are pulling out of the air in your grow room, and what you want is to push these particulates away from your plants.

Can I use a smaller diameter duct than what the fan is designed for?

We do not recommend this. Using ducting with a smaller diameter than the fan is designed for will cause the fan to run harder, greatly reducing CFM performance and overall efficiency. It will also cause excess noise.