Guangzhou Xingjin Fire Equipment Co.,Ltd.
| Payment Terms | T/T,L/C |
| Material | ABS plastic, aluminum alloy, custom wood |
| Function | Smoke Exhaust/ventilation |
| Installation | Wall/Ceilling Mounted |
| Supply Ability | 30000set/month |
| Model | AIC |
| Shape | Customized |
| Delivery Time | 15-20days |
| Product Name | ventilation Louvers Vent Cover Air Grille |
| Packaging Details | Plywood outer box with bubble bag or paper |
| Model Number | FHF-W/FHF-W-K/FHF-WS-FK/FHF-WSDC -K |
| Place of Origin | Guangzhou,China |
| Certification | GSG\TUV |
| Brand Name | XINGJIN |
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Product Specification
| Payment Terms | T/T,L/C | Material | ABS plastic, aluminum alloy, custom wood |
| Function | Smoke Exhaust/ventilation | Installation | Wall/Ceilling Mounted |
| Supply Ability | 30000set/month | Model | AIC |
| Shape | Customized | Delivery Time | 15-20days |
| Product Name | ventilation Louvers Vent Cover Air Grille | Packaging Details | Plywood outer box with bubble bag or paper |
| Model Number | FHF-W/FHF-W-K/FHF-WS-FK/FHF-WSDC -K | Place of Origin | Guangzhou,China |
| Certification | GSG\TUV | Brand Name | XINGJIN |
| High Light | 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:
| Facility Type | Specific Application | Recommended Configuration |
|---|---|---|
| Office Buildings | Positive pressure room automatic exhaust | Aluminum + Natural/White finish |
| Shopping Malls | Exhaust duct outlets, ventilation shaft outlets | Square/Rectangular structure |
| Hotels | Guest room positive pressure exhaust, equipment room exhaust | Aluminum + Powder coating |
| Hospitals | Clean area positive pressure exhaust, isolation room exhaust | Aluminum + Custom sizes |
| Schools | Classroom positive pressure exhaust, laboratory exhaust | Cost-effective configuration |
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
| Parameter | Specification |
|---|---|
| Product Name | Gravity Louver (Gravity Grille) |
| Function | Positive pressure automatic exhaust / Non-return |
| Material | High-strength aluminum alloy (A6063) |
| Blade Structure | Single layer, gravity-operated |
| Blade Orientation | Parallel to ground (rectangular: blades parallel to short side) |
| Surface Finish | Anodized / Powder coating / Baking paint |
| Standard Colors | Natural / White / Custom (RAL available) |
| Available Shapes | Square / Rectangular / Circular (all customizable) |
| Control Method | Mechanical (pressure differential activated) |
| Certification | ISO9001 |
| Brand | GUWEN |
Installation & Maintenance Instructions
| Item | Description |
|---|---|
| Installation | Flush mount — direct connection to exhaust duct or wall opening |
| Mounting Requirement | Blades must be parallel to ground — rectangular blades parallel to short side |
| Maintenance | Regular inspection of blade movement — clean surface dust |
| Application | Positive pressure rooms, exhaust duct outlets, ventilation shaft outlets |
| Note | Gravity louvers do not have airflow regulation function — not suitable for variable air volume control |
Application & Selection Recommendations
| Application Need | Recommended Configuration | Notes |
|---|---|---|
| Positive pressure room exhaust | Aluminum + Natural/White finish | Pressure-activated exhaust with backdraft prevention |
| Exhaust duct outlet | Aluminum + Rectangular | Installed at duct terminal — one-way exhaust |
| Ventilation shaft outlet | Aluminum + Square | Roof-top shaft exhaust — prevents rain ingress |
| Fresh air intake protection | Aluminum + Circular | Prevents backflow when fan is off |
| Outdoor/humid environments | Aluminum + Coated finish | Enhanced corrosion resistance |
Company Details
Business Type:
Manufacturer,Exporter
Year Established:
2010
Total Annual:
600000-1200000
Employee Number:
100~300
Ecer Certification：
Verified Supplier
About Us: Guangzhou Xingjin Fire Equipment Co., Ltd. is a professional enterprise dedicated to the research, development and production of HFC-227ea (FM200), Novec1230, CO2 and inert gas products. For many years, the company has been committed to improving product quality, enriching pro... About Us: Guangzhou Xingjin Fire Equipment Co., Ltd. is a professional enterprise dedicated to the research, development and production of HFC-227ea (FM200), Novec1230, CO2 and inert gas products. For many years, the company has been committed to improving product quality, enriching pro...
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