Features of Aosun Pipe Hood
- Used for protecting the ventilation system and guiding the air flow for discharge
- Excellent waterproof, rust-proof and corrosion-resistant properties
- Compatible with standard duct sizes for easy installation in residential and commercial systems
- Compliant with multiple international standards such as SAA, CE, and RoSH
- OEM & ODM customization available for size, material, and structure
Aosun | Professional Pipe Hood Manufacturer in China
Aosun is a leading Chinese manufacturer of pipe hood. We focus on independent R&D, strict quality control and systematic production to deliver durable, high-performance ventilation accessories for global clients. Our full-range pipe hoods cover complete sizes and multiple materials including stainless steel, galvanized steel and high-strength plastic, perfectly fitting residential, commercial, industrial and agricultural ventilation projects. Every Aosun pipe hood is engineered for effective rain protection, anti-backflow, insect prevention and anti-corrosion, greatly extending the service life of duct systems and improving overall ventilation efficiency. With flexible OEM & ODM customization, stable lead times and professional one-stop support, Aosun provides cost-effective and reliable outdoor vent solutions for worldwide distributors, contractors and engineering partners.
It is installed on the exterior wall of the building, which is the most common type. Installation and maintenance are both very simple.
Installed on the roof of buildings, it is specially designed for industrial and high-volume ventilation systems, featuring excellent wind resistance and rainproof capabilities.
Equipped with automatically opening and closing valves, it can effectively prevent the backflow of cold air and unpleasant odors.
A protective mesh has been added, which can prevent debris, birds and insects from entering the ventilation duct.
It has excellent corrosion resistance and water resistance, and it is very suitable for kitchens, bathrooms and industrial environments with chemical corrosion.
Low cost and lightweight. it is suitable for routine projects, and it has basic rust-proofing capabilities and durability.
What is a Pipe Hood？
The pipe hood is a duct end protection device, which specially installed at the exterior wall or roof outlet vent of ventilation systems. It also be called a vent hood, duct hood, exhaust hood, wall/roof cap. Its function is protecting the ventilation system, guiding airflow direction, and improving the overall durability of the duct system. Different from vent grill and diffuser, the pipe hood is designed for outer environment.
How Pipe Hood Works?
The working principle of the pipe hood is the unidirectional control of the airflow. The fan pushes the air into the pipe and then it flows towards the pipe hood installed at the outlet. The special structure of the pipe hood guides the airflow to be discharged horizontally or downward. The pipe hood can effectively prevent rainwater from entering the pipe, avoiding internal corrosion and water accumulation. If equipped with a check valve, it will automatically open when the fan starts and close immediately when the fan stops to prevent reverse flow.
Applications of Pipe Hood
Residential Ventilation
Bathrooms and kitchens have a high demand for exhaust. Pipe hood equipped with check valves can effectively prevent odors from flowing back and ensure fresh indoor air. If rainwater flows back into the ventilation ducts, it can easily lead to the growth of mold and bacteria, affecting the health of residents. The pipe caps adopt a rainproof structure, effectively preventing the backflow of rainwater and keeping the ducts dry.
Commercial Buildings
In commercial buildings such as shopping malls, hotels and restaurants, pipe hood can ensure stable exhaust airflow in the commercial space and enhance the comfort of people. Moreover, they effectively prevent external pollutants and debris from entering the ventilation system, reducing equipment wear and maintenance costs. The exposed vent duct will affect the appearance of the building. Pipe hood can be adapted to the exterior design of commercial buildings, which can improve the aesthetic appeal of the building.
Industrial Ventilation
The factory needs to discharge a large amount of dust, high temperatures and chemical gases, which can easily corrode the components of the air duct outlet. The pipe cap is made of high-strength and corrosion-resistant materials, which can withstand high temperatures and corrosive gases and protect the ventilation system. The stable structure of the pipe cap can meet the long-term operation requirements of the industry and ensure the stability of the exhaust. It can effectively prevent dust and debris from entering the air duct，and avoid duct blockage to ensure ventilation efficiency.
Agricultural Ventilation
Pipe hood is auxiliary component of agricultural ventilation systems. It is not commonly used in large-scale agricultural ventilation systems, but it is often applied in duct ventilation devices, such as small greenhouses, farmhouses and storage rooms, etc. The pipe cap can prevent rainwater from entering the pipe and keep the motor of the ventilation fan from getting damp. And the pipe cap is waterproof and not easy to rust. In agricultural environments where there are many mosquitoes and birds, the pipe hood with mesh screen can prevent them from entering the exhaust system and affecting the operation of the equipment.
Attic and Roof Ventilation
In summer, the accumulation of hot air in the attic can cause the indoor temperature to rise and increase the energy consumption of the air conditioner. The one-way exhaust structure of the pipe hood can effectively discharge the hot air in the attic and prevent cold air from flowing back in during winter. Rainwater seeping into the roof air ducts can damage the building structure and pose a risk of leakage. The waterproof design of the pipe cap effectively prevents rainwater infiltration and protects the roof duct and exhaust equipment.
Pipe Hood vs Vent Grille vs Diffuser
Install location
Pipe hood is usually installed outdoors. Vent grill is installed on the indoor ceiling or the wall.Diffuser is usually installed on the indoor ceiling.
Function
The pipe hood has the functions of rainproof and backflow prevention, which is mainly used for guiding and exhausting air. The vent grille can perform basic regulation of air volume and has decorative functions. The diffuser’s function is to evenly distribute the air flow and spread it throughout the space.
Airflow Pattern
The airflow of pipe hood is unidirectional airflow. The airflow of the vent grille is linear airflow. The airflow of the diffuser is diffused or rotational airflow.
In conclusion, pipe hood is designed for protection of exhaust pipe, the vent grilles and diffusers are indoor air terminals used for airflow control and distribution.
How to Choose Pipe Hood？
Duct Size
You should choose the pipe hood that matches the pipe size. If the pipe hood size is too small, it will cause airflow blockage, and if the pipe cap size is too large, it will cause poor protection effect. Aosun offers standard sizes available on the market, including 100mm (4 inches), 125mm (5 inches), 150mm (6 inches), and 200mm (8 inches). For industrial scenarios with high air volume requirements, Aosun provides large-sized specifications of 250 – 315mm.
Installation Location
If the air duct outlet is located on the exterior wall of the building, we recommend that you choose a wall-mounted pipe hood. This type of pipe cap is easy to install and precisely fits the exterior wall surface. It does not affect the appearance of the building and can effectively perform the functions of rainproofing and preventing backflow. If the duct outlet is on the roof, we suggest that you choose the roof-mounted pipe hood. This type of pipe cap adopts a reinforced structural design and has stronger wind resistance and rainstorm resistance, which can effectively resist adverse weather conditions.
Material Selection
Choose materials according to the use environment. Different types of pipe caps have different performance and costs. For regular residential scenarios, you can select galvanized steel or plastic pipe caps. It is cost-effective and has basic anti-corrosion and waterproof functions, which can meet the daily ventilation protection needs. For environments such as kitchens and industrial plants where there are cooking fumes and chemical corrosive gases, you can choose stainless steel pipe caps. Stainless steel has extremely strong corrosion resistance, oil resistance, and high-temperature resistance, and will not rust or deform over a long period of use.
Extra Features
In addition to the basic protection and diversion functions, you can also choose to add additional functions according to the personalized needs of specific scenarios. If there are situations where cold air or unpleasant odors are flowing back in the usage scenario, we recommend that you choose the pipe hood with check valve. The check valve is designed with an automatic opening and closing mechanism. It will automatically open when the fan is running and close quickly when the fan stops. If the usage scenario is facing insect and bird invasions, we suggest that you choose pipe hood with mesh screen to prevent foreign objects from entering the exhaust system.
Why Choose Aosun Pipe Hood?
When choosing a reliable pipe hood for your ventilation system, Aosun pipe hoods are your reliable choice. As a professional pipe cap manufacturer, we follow international standards such as ISO, ROHS and SAA to ensure that each pipe cover is made of high-quality materials. We offer a full range of standard sizes and flexible customization services, allowing you to customize materials, sizes, colors and other additional features according to your individual needs. Moreover, Aosun has a complete after-sales service, which can provide online technical guidance for you during installation and maintenance of the pipe hoods. If there are any quality issues with the product, Aosun offers a return and exchange service.
Under the premise of correct selection and installation, the pipe hood has a very small impact on the air volume. Its internal guiding structure is well-designed, enabling smooth discharge of the air flow outward without causing significant resistance. However, if the size of the pipe hood does not match the pipe, it may cause air flow blockage and a decrease in air volume.
Stainless steel is the most suitable material for outdoor pipe hood. It has excellent corrosion resistance and weather resistance, and can effectively resist the erosion of rainwater, moisture and chemical substances. Although its cost is higher than galvanized steel, plastic and other materials, its service life is long and maintenance requirements are low.
Whether you need a pipe hood with a mesh screen mainly depends on your usage environment. If there are often birds, insects or fallen leaves near the ventilation opening, it is necessary to install a pipe cap with a mesh screen. This can effectively prevent debris from entering the pipe. However, the mesh structure will slightly increase wind resistance, and it is prone to being clogged by oil or frost in environments with high humidity or for efficient exhaust purposes. If the environment is clean and the primary goal is efficient exhaust, you don’t have to choose the mesh screen.
You should choose one based on duct outlet location. For exterior wall outlets, you can use a wall-mounted pipe hood, which is easy to install and maintain. For roof outlets, you can choose a roof pipe hood, which features reinforced wind resistance and rainproof performance for harsh weather.
Standard pipe hood is usually designed for unidirectional airflow and is mainly used for exhaust. If used for intake, ordinary pipe hood cannot effectively filter dust or block rainwater, which may cause debris and moisture to directly enter the system. Therefore, ordinary exhaust covers are not recommended to be directly used for intake.
The common standard sizes are 100mm (4 inches), 125mm (5 inches), 150mm (6 inches) and 200mm (8 inches). They are suitable for most household bathrooms, kitchens and small commercial exhaust systems. For industrial or high-ventilation scenarios, manufacturers usually offer larger sizes such as 250mm to 315mm. We recommend that you measure the pipe diameter first and then choose the matching size of the pipe hood.
It is not complicated to install a pipe hood. The entire process does not require any special tools. An ordinary electric drill, screwdriver and sealant can be completed. For the common wall-mounted models, you just need to align the base of the pipe hood with the exterior wall vent, fix it with screws, and use sealant to prevent water leakage. The roof-mounted installation is a bit more complicated, but it can still be done by yourself.
The lifespan of the pipe cover mainly depends on the material and the usage environment. Stainless steel is the most durable, and can be used for 15 to 20 years in general outdoor conditions. Galvanized steel has a lifespan of approximately 5 to 10 years, but in humid or industrial polluted environments, it will be shortened to 3 to 5 years. Aluminum alloy has good anti-corrosion performance and usually lasts for 10 to 15 years. Plastic generally lasts for 3 to 8 years, but it will age and become brittle with long-term exposure to sunlight.
The maintenance requirements for pipe hoods are very low, but regular inspections can effectively extend their lifespan. We suggest that you clean the dust and debris on the mesh screen at least once a year to prevent blockage and affect the exhaust. For models with check valves, if the valve plates do not operate smoothly, you can use lubricating oil for maintenance. Overall, each maintenance only takes a few minutes.
First, you need to observe the appearance of the pipe hood. If you find obvious damage, rust or deformation, it needs to be replaced. Secondly, if the walls and ceiling start to seep water, it indicates that the pipe hood is unable to prevent rainwater and you need to replace it. Third, if you detect an unpleasant smell coming back from the pipes. Fourth, the air volume has significantly decreased, but there is no blockage in the pipes.
