Features of Aosun Exhaust Fan
- Built with reliable and durable exhaust fan materials
- Designed with low noise technology, producing just 40 decibels
- Resistant to corrosive environments
- Versatile exhaust fans, suitable for integration in tube, ducts, and pipes
- Stable pressure and high air volume
Your Trusted Exhaust Fan Manufacturer in China
Aosun’s exhaust fan is a ventilation device that pulls out air moisture, dust, smoke, odors, and hot air from indoor spaces. This helps enhance the quality of indoor air and keeps the environment comfortable. Our exhaust fan is made from lightweight and durable sheet molding compound (SMC) housing, and corrosion-resistant aluminum alloy blades. Aosun offers exhaust fans in a range of sizes from 150 mm to 1200 mm diameter, with 3 to 7 blades to ensure effective ventilation.
Aosun also offers a variety of exhaust fans such as wall-mounted, ceiling-mounted, roof-mounted, inline, industrial, centrifugal, axial and explosion-proof exhaust fans. They are also available in different controllers like thermostats, remote, timers, and humidity sensors. Using either or both centrifugal or axial impellers, our exhaust fans provide an excellent low noise performance for up to 40 decibels only. Additionally, our exhaust fans feature durable blades, powerful motors, low energy use, and built-in safety functions.
Our exhaust fan supports better air circulation on HVAC systems, perfect for kitchen, bathrooms, warehouses, and industrial sites. As a trusted exhaust fan manufacturer, Aosun is dedicated to providing high-quality exhaust fans that ensures long lasting performance.
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Our Electric Wall-Mounted Exhaust Fan features a durable aluminum alloy body, copper motor, and plastic blades for efficient airflow.
Aosun offers a two way exhaust fan that remote control and designed with pure copper wire and double bearing motor that provide high speed and low energy.
Our brushless exhaust fan is made with a PBT frame and impeller, it offers reliable performance for PC cases, refrigerators, and server chassis.
This exhaust fan ensures efficient airflow and reliable performance, making it ideal for manufacturing plants.
Aosun’s ventilation exhaust fan built with silent and efficient ventilation that features an EC motor with a nominal speed.
Our Super Silent Industrial Exhaust Fan performs powerful airflow with minimal noise with the features of a backward curved blade design.
Theis exhaust fan features a durable copper motor, sleeve or 2-ball bearing options, and a robust aluminum alloy frame.
Designed with a 2-way airflow system and automatic shutter, it efficiently removes odors and it is made durable and quiet.
What is the Exhaust Fan？
An exhaust fan, also known as an extractor fan, is a mechanical device used for ventilation. It is difficult to circulate air in closed or poorly ventilated environments, as well as in polluted environments. The dust, temperature, and oil accumulation cannot be effectively circulated. Exhaust fans effectively solve this problem. You can choose it in domestic premises, commercial premises, and industrial premises to improve air quality by enhancing air flow and removing fumes and pollutants.
Key Components of Exhaust Fans
- Fan Blades: The fan blades rotate all the time during operation to generate airflow and push the air to circulate quickly.
- Motor: The motor provides constant and stable power for the rotation of the fan blades and ensures the operation of the exhaust fan.
- Housing: The exhaust fan housing has excellent mechanical strength, which makes it an excellent structural support and protects the internal components. The housing also reduces noise to a certain extent and maintains quiet and stable operation.
- Grille: The grille is used to cover the opening of the fan, ensuring a steady flow of air and preventing the entry of debris and foreign objects.
Advantages of Exhaust Fans
Reduced Operating Costs
Exhaust fans provide efficient exhaust with less power. You can also consider exhaust fans with inverter motors. They stop running when they are not needed to improve energy efficiency. In turn, this reduces your costs. In addition, its reliability gives it less risk of damage, which reduces the time and cost lost in repairs.
Intelligent Control
Some exhaust fans come with advanced temperature and humidity sensors that intelligently adjust and operate according to the current conditions to maintain the temperature and humidity within your desired range. This not only reduces energy loss but also reduces labour costs.
Low Noise
The exhaust fan maintains a low noise level during operation, and its housing further reduces the impact of noise. For business applications that can enhance the customer experience for you. If you are going to use an exhaust fan in a sound-sensitive place, opt for a professional low-decibel exhaust fan.
Dust Load
It is an ideal exhaust fan for industrial environments that are prone to dust and material particles. It handles these impurities efficiently and achieves stable operation while ensuring excellent air quality.
Functions of Exhaust Fans
- Promote air circulation: For confined spaces or spaces that are susceptible to contamination, using an exhaust fan can speed up air circulation and improve air quality for you.
- Control temperature and humidity: You can use exhaust fans for humid environments such as toilets and kitchens, or moisture-sensitive spaces such as warehouses. This can effectively remove humid air and keep the air dry, thus preventing mould growth.
- Exhaust impurities: Exhaust fans remove contaminated air with dust and grease and replace it with fresh air. You can use them in kitchens and industrial manufacturing.
How Does an Exhaust Fan Work?
When an exhaust fan begins to operate, the motor drives the blades to rotate and bring in airflow, which drives the air out of the exhaust vents, thus allowing the air in the space to be expelled. In addition, it creates a pressure differential between the inside and outside of the space, which causes outside air to be drawn into the space, thereby replacing the air in the space with fresh outside air, thus improving air quality, temperature, and humidity.
Types of Exhaust Fan
Exhaust Fans for Different Establishments
- Bathroom Exhaust Fans: Bathroom Exhaust Fans can efficiently remove moist air from more enclosed spaces, keeping bathrooms dry and preventing mold growth. It also removes odours from toilets to ensure good air quality.
- Kitchen Exhaust Fans: Kitchen exhaust fans are specifically designed to remove fumes and maintain a clean environment. Additionally, it allows for good ventilation to prevent gas from collecting in the air and causing harm.
- Industrial Exhaust Fans: Industrial exhaust fans with high performance, mechanical strength, and durability provide excellent exhaust, dust removal, heat dissipation, and dehumidification. This not only ensures efficient production but also extends the service life of your equipment and protects workers’ health.
Duct Fans with Different Operating Principles
- Axial Exhaust Fan: Axial exhaust fan relies on the airflow generated by the rotation of the impeller to promote air flow to achieve efficient air supply. Axial exhaust fans are simple in structure and flexible in installation. You can choose an axial exhaust fan for small to medium-sized spaces, and it can handle large volumes of air discharge. However, it is not suitable for ventilation systems with long ducts.
- Inline Duct Exhaust Fan: An inline duct fan is mounted directly on the wall or ceiling. It has a much higher extraction capacity and can bring powerful air extraction to ventilation systems with long ducts.
- Centrifugal Exhaust Fans: Centrifugal exhaust fans rely on the centrifugal force generated by the high-speed rotation of the blades, which draws in and pushes the airflow, discharging it perpendicularly to the air inlet. You can benefit from the centrifugal exhaust fan’s greater resistance to static pressure by using it in ventilation systems with long ducts and many bends. However, it generates more noise than other exhaust fans.
- Mixed-flow exhaust fans: Mixed-flow exhaust fans combine the performance of axial and centrifugal extract fans, delivering excellent performance while keeping noise levels low. This allows you to use it in almost any scenario.
Applications of Exhaust Fans
Family Homes
You can choose an exhaust fan for your family home project, which can be installed in bathrooms, laundry rooms, and kitchens. It not only ensures good air circulation to offer a comfortable indoor environment, but also removes fumes and moisture, keeping the room odourless, tidy, and safe. In addition, good temperature and humidity also extend the life of paint and furniture to a certain extent.
Commercial Applications
You can use it in crowded places for efficient air circulation, maintaining good temperature, humidity, and air quality. You can also use it in libraries and medical facilities, where it not only meets strict air quality standards but also operates with low noise levels.
Industrial Applications
Industrial manufacturing generates dust, fumes, and debris that can affect the quality of your products. Exhaust fans provide timely relief. This also extends the life of your industrial machinery and protects the health of your workers. Thus, it increases your productivity and reduces production costs.
Warehouse Storage
The exhaust fan keeps working continuously around the clock and reduces the temperature inside the warehouse to keep the products fresh. It keeps the warehouse dry to reduce mould growth and increase the safety of your products. It also prevents damage to products due to humidity.
These three types of exhaust fans target very different pollutants, therefore their design standards differ:
Bathroom Exhaust Fans:
Core Task: Removes high-humidity air, preventing condensation, mold growth, and wall damage.
Key Indicators: Continuous operation and low noise. A good bathroom fan should be able to run quietly for an extended period (e.g., 30 minutes after showering) to thoroughly remove moisture. It is recommended to choose a model with automatic humidity sensor control.
Kitchen Exhaust Fans (Non-Range Hoods):
Core Task: Supplemental smoke extraction, removing residual heat, moisture, and light grease from cooking, as well as combustion byproducts from gas stoves (such as carbon monoxide).
Key Indicators: Higher airflow and temperature resistance. Typically requires more power than bathroom fans, and the motor and casing should be able to withstand certain temperatures. Ideally, it should be installed in the upper part of the kitchen to capture rising hot air.
Attic/Ceiling Exhaust Fan:
Core Function: Passive temperature regulation, expelling hot air accumulated under the roof, protecting the roof structure and reducing the air conditioning load on the floor below.
Key Specifications: High airflow and excellent waterproof/dustproof performance. Typically automatically controlled by attic temperature or sunlight intensity (driven by a thermostat or solar panel), requiring no daily manual operation.
CFM is fundamental, but if the fan is too noisy, users will reduce usage time due to annoyance, significantly reducing dehumidification effectiveness.
Quantifying “quiet”: Focus on the “Sones” value. 1 Sone is roughly equivalent to the hum of a quiet refrigerator. Excellent fans can operate at a noise level as low as 0.3 – 1.0 Sones. Quietness is crucial for an adjoining bathroom to the bedroom.
Demonstrating “efficient”: Look at the airflow per watt of electricity. Efficient fans (especially DC motors) produce the same CFM with less electricity, resulting in long-term electricity cost savings and greater environmental friendliness.
Balance and Prioritization: For the master bathroom, quietness should be prioritized to ensure users are willing to use it for extended periods. For guest bathrooms or areas less sensitive to noise, a more cost-effective, high-efficiency model can be chosen while maintaining basic quietness (e.g., <2 Sones). The best choice is a DC motor fan that combines low sones and low power consumption.
“Backflow” can cause moisture and contaminants to damage the building structure and is one of the most serious installation mistakes.
Absolute Principle: The exhaust duct must lead directly to the outside via the shortest path, and a dedicated windproof and rainproof exhaust hood must be installed at the end on the exterior wall or roof.
Correct Operating Procedures:
Use rigid metal ducts or dedicated flexible aluminum foil ducts with smooth inner walls. Avoid using easily crushed plastic corrugated pipes.
Ensure that duct connections are completely sealed. Seal all joints with aluminum foil tape (not ordinary tape).
The duct should be as straight as possible, minimizing bends. Necessary bends should be smooth bends, not sharp bends.
The terminal exhaust hood must have a movable windproof baffle that automatically closes when the fan is not operating to prevent cold outdoor air, insects, or rainwater from flowing back in.
It is strictly forbidden to simply terminate the exhaust pipe in the attic, ceiling, under the eaves, or in the cavity of the brick wall.
For historic buildings or rooms with challenging renovations, the following solutions are available:
Exterior Wall-Mounted Fans: This is the ideal alternative. A hole is cut in the wall to match the fan’s size, and the fan is installed directly into the wall, eliminating the need for long ductwork. It has the shortest exhaust path and highest efficiency.
Window-Mounted Exhaust Fans: A temporary or semi-permanent solution that can be installed in standard window frames, suitable for rental properties or seasonal use.
Micro-duct Ventilation Systems:
Use thin, flexible ducts with a diameter of only 3-4 inches.
Advantages: Can flexibly navigate through narrow spaces such as joists and beams, with minimal damage to the wall structure.
Disadvantages: Due to the small duct cross-sectional area, air resistance is relatively high, requiring a specially designed high static pressure fan, and the airflow is usually limited (suitable for small spaces such as bathrooms).
Heat Recovery Ventilators (HRV/ERV): This is a high-end option for luxury home renovations requiring overall fresh air exchange. It uses a centralized, high-efficiency heat exchange core to introduce fresh air and exchange heat while expelling stale air, achieving the highest energy efficiency.
This relates to convenience and future maintenance costs.
Integrated Lighting:
Advantages: Clean, unified appearance, strong design appeal.
Disadvantages: If the LED panel fails, the entire lighting module often needs to be replaced, resulting in higher costs. The light source cannot be freely selected.
Separate Lighting (Independent Light and Fan):
Advantages: Extremely high maintenance flexibility. You can replace any standard E26 or GU24 screw-in bulb or LED module individually, resulting in lower costs and more choices (such as the option to replace with smart bulbs). Failure of one component (fan or light) does not affect the other.
Disadvantages: The appearance may have two separate covers or be slightly more complex.
Development Trends and Recommendations: Mainstream high-quality models on the market are shifting towards using long-life integrated LEDs, whose lifespan is often comparable to that of the fan motor (10 years or more), reducing maintenance concerns. When purchasing, be sure to check the product specifications for the rated LED lifespan in hours (e.g., 50,000 hours) and whether it can be replaced separately. For consumers who prioritize long-term maintenance convenience, choosing a fan equipped with a standard screw-in lamp holder is the safest option.
Modern smart exhaust fans have transcended simple remote controls, becoming a crucial component of home health and environmental automation.
Core Smart Functions:
Automatic Sensor Control:
Humidity Sensor: Automatically activates when humidity is detected as excessive and delays shutdown after humidity returns to normal.
Motion Sensor: Automatically turns on lights when someone enters the bathroom and automatically turns off lights and delays ventilation after the person leaves.
Volatile Organic Compound (VOC) Sensor: Automatically activates when it detects odors in the toilet or cleaning chemicals.
Advanced Integration and Scheduling:
Smart Home Platform Integration: Integrates with smart locks to automatically check and turn off the fan when leaving home; integrates with sleep mode to automatically reduce fan speed or silence the fan at bedtime.
Time-Based Scheduling: Sets for automatic operation during off-peak electricity hours to ventilate the attic.
Operating Status Monitoring and Reminders: Sends filter replacement reminders, operating time reports, and even fault warnings via the app.
Practical value: These features ensure that the exhaust fan works automatically when needed, avoiding human forgetfulness and achieving fully automatic environmental management with “set and forget”. In terms of energy saving, mold prevention and maintaining indoor air quality, it is far more effective than traditional manually operated fans.
Garages, especially those with attached workshops or parking spaces for internal combustion engine vehicles, are strongly recommended to have an exhaust fan.
Why is it needed? To remove vehicle exhaust fumes (containing carbon monoxide), paint/solvent vapors, welding fumes, dust, and hot air accumulated in summer.
Exhaust vs. Supply Air:
* Exhaust Mode (Negative Pressure): This is the safest and most recommended mode. The fan is installed high up at the far end of the garage, exhausting air outwards. This directly expels hazardous exhaust gases outdoors and ensures fresh air is drawn in through gaps under the garage door, preventing potentially contaminated air from being blown into living areas.
* Supply Air Mode (Positive Pressure): Used only in specific situations, such as when filtered clean air needs to be forcefully injected into the garage. However, there is a risk of pushing exhaust gases into corners or forcing them into adjacent rooms through gaps.
Best Practice: For typical home garages, installing a powerful exhaust fan controlled by a timer or CO detector is the best option. Ensure that its exhaust volume is large enough to complete a full air exchange in a short time (e.g., 5-10 minutes).
This is a common problem that needs to be addressed from both the exhaust vent and the entry point.
Exhaust Vent Protection: Ensure that the exhaust hood on the exterior wall is equipped with a tightly closed windproof baffle. This is the first physical barrier. Additionally, an extra layer of fine-mesh stainless steel insect screen (approximately 16 mesh or larger) can be installed inside the baffle. Regularly check and clean the screen to remove dust and lint to prevent it from affecting airflow.
Fan Body Protection: Some high-end exhaust fans also feature a removable insect filter at the air inlet (behind the indoor grille) to block larger flying insects and lint.
Chemical Assistance: In a safe area around the exhaust vent, use a long-lasting outdoor insecticide spray (follow instructions) to create a protective barrier.
Important Note: Never completely seal off the air inlet or use an overly dense filter for insect prevention. This will severely increase wind resistance, leading to a sudden decrease in airflow, motor overload, and increased noise.
The delayed shutdown function means that after the switch is turned off, the fan continues to run for a period of time (e.g., 5, 10, 20, 30 minutes) before automatically stopping.
How it works: The fan has an internal time-delay relay or is implemented through a smart circuit.
Core value: Ensuring thorough ventilation. For example, in a bathroom, humidity is still high after showering. If you immediately turn off the lights and leave, the moisture won’t be completely removed. The delay function allows it to continue working after you leave, thoroughly removing residual moisture.
Delay time setting guidelines:
Bathroom: At least 20-30 minutes. This is the time needed for humid air to completely escape and for walls and towels to dry.
Kitchen: Set for 10-15 minutes after cooking to remove residual heat and odors.
Toilet: Set for 5-10 minutes, sufficient to remove odors.
Attic: Automatically controlled by a thermostat, typically running continuously for several hours at high temperatures.
Advanced features: Some smart fans can automatically adjust their delay time based on sensor readings, such as stopping only after the humidity drops to a set value, which is more scientific.
Advantages: Conforms to modern home habits; can be installed alongside other light switches for a neat appearance. Can be easily integrated with smart switch modules for remote and automated control.
Disadvantages: Easy to forget to turn off, causing the fan to run idle and consume power.
Pull-Cord Switch:
Advantages: Simple and reliable mechanical structure with an extremely low failure rate. Installed directly on the fan body, eliminating the need for a separate wired remote switch, resulting in low installation costs. The physical pull cord provides a clear “on/off” status indicator, making it less likely to be forgotten.
Disadvantages: Less aesthetically pleasing; may be out of reach in rooms with high ceilings.
Combined Solutions and Trends:
Switch + Delay Function: This is currently the most mainstream solution. Regardless of whether a wall switch or pull cord is used, an automatic delay occurs after turning off, balancing convenience and effectiveness.
Smart Sensor Control: Completely eliminates the need for manual switching; controlled automatically by sensors, representing the future direction.
Recommendation: For new renovations, we recommend installing wall switches with a time-delay function. For retrofitting or budget-constrained installations, pull-cord fans with a time-delay function are a practical choice.
