Highlight:
High-strength aluminum alloy Gravity Louver
, Non-return function Gravity Grille
, Custom sizes Automatic Exhaust Device
Product Introduction
The Gravity Louver (Gravity Grille) is a non-return automatic exhaust device specifically designed for positive pressure commercial building HVAC systems. Manufactured from high-strength aluminum profiles, it operates using the natural downward force of gravity — blades open to exhaust air when indoor pressure exceeds outdoor pressure, and automatically close to prevent backdraft when pressure equalizes. This product is widely used for automatic exhaust in office buildings, shopping malls, hotels, hospitals, and other commercial spaces with positive pressure air conditioning systems.
Applicable Locations
With its purely mechanical gravity operation, requiring no power supply and minimal maintenance, the Gravity Louver is widely used for commercial building automatic exhaust applications. Typical applications include:
Product Advantages
1. Gravity Closure – Non-Return Backdraft Prevention
Blades naturally hang downward by gravity. When indoor pressure exceeds outdoor pressure, airflow pushes blades open for exhaust. When exhaust stops or indoor pressure drops, blades automatically close. This design effectively isolates indoor-outdoor air exchange and prevents reverse airflow — providing reliable non-return function.
2. No Power Required – Energy-Saving and Maintenance-Free
Pure mechanical design — no external power or electrical control needed. Operates automatically based on pressure difference and gravity. Zero energy consumption, zero noise, zero maintenance — more energy-efficient than motorized dampers. Ideal for standard pressure exhaust applications without signal control requirements.
3. Aluminum Alloy – Lightweight and Durable
Manufactured from high-strength aluminum alloy — lightweight, high strength, resistant to deformation and corrosion. Available with anodized, powder coating, or baking paint finish — suitable for both indoor and outdoor applications.
4. Sturdy Construction – Good Sealing
Blades and frame fit tightly together. When closed, effectively isolates airflow. Optional sealing gaskets available for enhanced airtightness. Blades are parallel to the ground — rectangular louvers typically have blades parallel to the short side for a clean, organized appearance.
5. Custom Sizes – Adaptable to Various Duct Requirements
Available in square, rectangular, and circular configurations. All sizes can be customized to suit exhaust ducts, ventilation shafts, fresh air intakes, and other project requirements. Custom colors available including natural, white, and RAL standard colors.
Technical Specifications
Installation & Maintenance Instructions
Application & Selection Recommendations
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