Windproof Vent Cover
A windproof and rain-protective vent cover for exterior wall exhaust outlets.
Built with a dual-duct split-flow design, it helps reduce strong-wind backdraft, odor return, and rain intrusion while supporting more stable exhaust performance.
A windproof and rain-protective solution for exterior wall exhaust outlets
The Windproof Vent Cover is designed for exterior wall exhaust terminals. It helps reduce backdraft, odor return, rain intrusion, and unstable exhaust outlet performance.
It is suitable for bathrooms, kitchens, and other spaces that need stable exhaust.
Get the final part of the exhaust system right
The product is not only about covering the outlet. It helps the exhaust system stay more stable when outdoor wind, rain, moisture, or odor affects the outlet end.
Not only the shape, but how airflow is handled
The internal structure is designed to help exhaust remain more stable in strong-wind conditions.
Dual-Duct Split-Flow Design
Separates indoor exhaust from outdoor wind flow to reduce direct wind interference.
Triple-Layer Structure
Combines outlet openings and internal airflow protection for exhaust and shielding.
Annular Airflow Guidance
Guides exhaust through a bowl-shaped guide plate and annular flow path.
304 Stainless Steel
Suitable for exterior wall use under sun, rain, wind, and moisture exposure.
Stable exhaust, rain protection, and backflow control
The product helps improve the outlet-end stability of the exhaust system under unfavorable outdoor conditions.
Reduces wind backdraft interference
Helps reduce outdoor wind pressure affecting the exhaust direction.
Reduces odor and fume return
Helps lower the chance of bathroom moisture, kitchen fumes, or outdoor odors returning indoors.
Reduces rain and moisture intrusion
Combines windproof and rain-protective functions at the exhaust outlet.
Supports stable equipment performance
A more stable outlet helps bathroom exhaust, heater fans, and kitchen exhaust systems work more consistently.
Supported by wind tunnel testing
The Windproof Vent Cover was tested in the wind tunnel laboratory of National Central University.
Using HG-H06 as an example, under frontal and side wind at 51.5 m/s for one minute, smoke could still be discharged under the test conditions.
Level-16 wind condition
Wind speed around 51.5 m/s.
National Central University Wind Tunnel Lab
Used to observe exhaust performance under high wind-pressure conditions.
Smoke could still discharge
Smoke discharge was observed under frontal and side wind conditions.
Different from a standard exterior vent cover
The difference is not only appearance. The key is whether strong wind, rain, and exhaust stability are considered together.
Basic outlet shielding
- Usually focuses on covering the outlet.
- Handling of wind, angled rain, and backdraft is usually limited.
- May be insufficient for wind-facing walls or high-floor conditions.
Airflow guidance and outlet-end protection
- Uses split-flow, annular airflow guidance, and internal protection.
- Designed to support stable exhaust under strong-wind conditions.
- Suitable for reducing backdraft, odor return, and rain intrusion risk.
Choose by application and duct size
The product includes bathroom and kitchen series. Selection should match the application and duct diameter.
Bathroom Series
- HG-F03: 3" / 7.5 cm
- HG-F04: 4" / 10 cm
Kitchen Series
- HG-H05: 5" / 12.5 cm
- HG-H06: 6" / 15 cm
Suitable exhaust systems
It is worth evaluating when the exhaust outlet is located on an exterior wall and outlet-end stability matters.
Bathroom Exhaust Systems
For reducing moisture return, odor backdraft, and rain intrusion risk.
Kitchen Exhaust Systems
For reducing cooking-fume or odor return when the outlet is affected by wind.
Wind-Facing Walls and High Floors
Useful where wind pressure can affect the exhaust outlet.
Coastal or Open Areas
Worth evaluating where wind and rain conditions are more severe.
Check site conditions before choosing
Product performance depends on duct size, wall location, equipment type, and installation conditions.
Confirm duct size
Make sure the duct diameter matches the product specification.
Check wall exposure
Wind-facing walls, building corners, or high wind-pressure areas need more careful evaluation.
Confirm equipment type
Bathroom exhaust, heater fans, kitchen exhaust, and other systems may require different specifications.
Check existing backdraft or odor issues
If problems already exist, internal airflow design should be considered, not only size and appearance.
Review installation conditions
Wall thickness, outlet method, wall material, and waterproof finishing can affect final performance.
Learn more about installation, exhaust efficiency, and backdraft
Continue reading related resources, FAQ, glossary terms, or catalog information.
Windproof Vent Cover Resources
Read more about backdraft, exhaust efficiency, installation checks, and strong-wind selection.
Windproof Vent Cover FAQ
Review common questions about exhaust efficiency, suitable spaces, installation, and backdraft.
Related Glossary
Start with backdraft, exhaust efficiency, duct termination, and airflow rate.
Catalog Downloads
Download product information for specification review and comparison.
Need help choosing the right Windproof Vent Cover specification?
Contact HENGJHU for product evaluation. We can help review duct size, site conditions, and application needs before quotation or consultation.