Fan Controllers

What Are Fan Controllers?

Fan controllers are devices used to regulate the speed and operation of extractor fans in indoor growing environments. Instead of running fans at full power constantly, controllers allow you to adjust airflow based on temperature and environmental conditions.

This helps maintain a stable grow room climate while reducing unnecessary energy use and noise.

Why Use a Fan Controller?

Without a controller, extractor fans typically run at full speed all the time. A fan controller allows you to fine-tune airflow and respond to changes in your grow environment.

• Regulates temperature automatically
• Maintains consistent airflow and air exchange
• Reduces noise from fans running at full power
• Saves energy by adjusting fan speed as needed
• Helps maintain proper negative pressure for odour control

By controlling fan speed, you can create a more efficient and stable indoor growing setup.

Types of Fan Controllers

There are several types of fan controllers available depending on your setup and level of control required:

• Manual fan speed controllers – allow you to set fan speed manually
• Thermostatic controllers – automatically adjust fan speed based on temperature
• EC fan controllers – designed for energy-efficient EC fans with precise control
• Hybrid and advanced controllers – combine automatic and manual control with additional features

More advanced controllers can manage both intake and extraction fans, helping maintain balanced airflow and stable conditions.

How Fan Controllers Work

Fan controllers monitor environmental conditions, typically using a temperature probe placed in the grow space. When temperatures rise, the controller increases fan speed; when temperatures drop, it reduces speed.

This automated adjustment helps maintain consistent growing conditions without constant manual intervention.

Fan Controllers and Ventilation Systems

Fan controllers are used as part of a complete ventilation system and work alongside:

• Extractor fans to remove stale air
• Carbon filters for odour control
• Ducting and accessories to direct airflow
• Air circulation fans to move air within the space

This combination ensures that airflow is not only effective but also precisely controlled.

Fan Controllers in Grow Tents

Grow tents benefit significantly from fan controllers, as conditions can change quickly in a small enclosed space. Heat from grow lights can cause temperature spikes, making automatic fan control essential.

A fan controller helps maintain a consistent environment, improving plant health and reducing the risk of stress caused by temperature fluctuations.

Choosing the Right Fan Controller

When selecting a fan controller, consider:

• The type of fan you are using (AC or EC)
• The size of your grow space
• Whether you need automatic temperature control
• The level of precision and features required

Basic controllers are suitable for small setups, while advanced units provide full environmental control for larger grow rooms.

Helpful Guides for Climate Control

If you want to learn more about managing your grow environment, explore our guides:

• Grow Room Ventilation Guide
• Temperature and Humidity Guide
• Ventilation in Grow Tents

These guides will help you understand how to optimise airflow and environmental control.

Shop Fan Controllers in the UK

At Acorn Horticulture, we stock a wide range of fan controllers for indoor growers across the UK. From simple speed controllers to advanced climate control units, our range is designed to help you maintain the perfect growing environment.

Browse our full selection above to find the right fan controller for your setup.

FAQs

What does a fan controller do?

A fan controller adjusts fan speed based on temperature, helping maintain stable conditions in your grow space.

Do I need a fan controller?

While not essential, fan controllers greatly improve control over temperature, airflow and energy efficiency.

What is the difference between AC and EC fan controllers?

AC controllers are for standard fans, while EC controllers are designed for energy-efficient EC fans with more precise control.

Can fan controllers reduce noise?

Yes, by reducing fan speed when full power is not needed, fan controllers can significantly lower noise levels.