Gravity Shutter Louvres

Gravity shutter louvres are designed to protect ductwork and ventilation openings from weather, backdrafts, and debris. Their self-closing shutter mechanism automatically regulates airflow while preventing reverse airflow, ensuring system efficiency. 

Ideal for commercial, industrial, and residential installations, they combine durability with minimal maintenance.

Where gravity shutter louvres are used

Gravity shutter louvres are ideal for commercial, industrial, and residential ducted ventilation systems. They prevent backdrafts, debris ingress, and weather-related damage while maintaining efficient airflow. 

These louvres are especially effective in roof or wall penetrations where wind and environmental exposure can impact system performance. For a broader selection of weather protection solutions, see our weather louvres category.

Benefits of gravity shutter louvres

Gravity shutter louvres reduce energy loss by preventing reverse airflow, protect ductwork from weather and debris, and require minimal maintenance. They provide reliable, long-term performance in harsh environments and help maintain consistent system efficiency. 

Additionally, they enhance indoor air quality by preventing contamination from external pollutants.

Bespoke and Made-to-Order options

For non-standard openings or unique size and finish requirements, eFans offers custom solutions. Our Made-to-Order Louvres provide precise dimensions, materials, and finishes to meet the exact demands of your project. 

These options are ideal for specialised commercial or industrial installations where standard sizes are insufficient.

How do gravity shutter louvres prevent backdraft?

Gravity shutter louvres use weighted or spring-loaded blades that close automatically when airflow stops, preventing backdrafts and protecting duct systems from unwanted air or contaminants. This maintains consistent ventilation and system efficiency.

Can gravity shutter louvres be installed horizontally or vertically?

Yes. Most models support flexible installation for both vertical wall penetrations and horizontal roof mounts. Always follow manufacturer guidelines to ensure correct blade movement and optimal airflow performance.

Do gravity shutter louvres require maintenance?

Maintenance is minimal. Routine inspection and cleaning to remove dust or debris keep blades moving freely and maintain reliable operation. Proper installation also helps reduce wear and extend product life.

What materials are best for long-term durability?

Aluminium provides lightweight, corrosion-resistant performance in coastal or humid environments, while galvanised steel offers greater durability for industrial use. Selecting the right material ensures long-term reliability and system protection.

Are gravity shutter louvres suitable for high-velocity airflow?

Yes, provided the louvre size and blade design match the system’s airflow rate. Incorrect sizing can cause noise or increased pressure drop, so checking velocity and performance ratings before installation is essential.