


Devices used in outdoor or factory environments are often exposed to water, dust, and other harsh conditions. The fans integrated into these devices must also meet strict waterproof and dustproof standards to ensure reliable operation.
This article provides a detailed overview of how Splash Proof Fans work, their key features, and IP (Ingress Protection) ratings , along with case studies.
We will explain how Splash Proof Fan works.
These fans are designed with waterproof features that allow them to operate safely in environments where they may be exposed to water.
The motor and circuit board are coated with resin, creating a sealed structure that prevents water and dust from entering the live electrical components.

The IP (Ingress Protection) rating of our Splash Proof Fan series is based on IEC 60529 and applies only to live electrical components, such as motor coils and electronic parts. Mechanical components such as impellers and bearings are not included in this rating, so under certain conditions—like condensation or water exposure—these parts may be impacted.
When using the product for extended periods in environments exposed to dust, water, or condensation, implement appropriate countermeasures and evaluate based on specific usage conditions.
* For detailed information, please refer to the safety precautions..
The protection rating (IP code) that indicates waterproof performance is a rating from 0 to 6 for protection against intrusion of foreign objects into electrical components inside a device (in the case of a fan, electronic components and motor coils), and a rating from 0 to 8 for protection against intrusion of water. For example, in the case of IP65, protection against intrusion of foreign objects is "6, dustproof," and protection against intrusion of water is "5, protected against jets."
The required protection rating varies depending on the operating environment. Generally, ratings such as IP55, IP65, IP67, and IP68 are widely used. Our Splash Proof Fans provide protection ratings from IP54 to IP68.
*Protection ratings (IP codes) are specified in IEC (International Electrotechnical Commission) 60529.
Here are several case studies illustrating the implementation of Splash Proof Fans in actual devices and systems.
•The protection rating (IP code) of the Splash Proof Fan series is based on IEC 60529 and applies only to the live parts of the motor coils and electrical components. Mechanical parts that are not electrically active are excluded from this evaluation. When using the product over an extended period in environments exposed to dust, water, or condensation, please implement appropriate countermeasures and conduct evaluations based on the specific usage conditions.
• During equipment maintenance, do not attempt to wash the fan, as this may result in malfunction or damage.
* For detailed information, please refer to the safety precautions.
*Based on the fan used in this specific case study.

Learn more:Splash Proof Fans that Fulfill High Requirements for Durability, Reliability, and Energy Efficiency.

Learn more: High static pressure "Splash Proof Centrifugal Fan" allows for outdoor installation!
Learn more: IP68 Splash Proof Fan with PWM control function for optimal fermentation management


Apart from the cases mentioned above, Splash Proof Fans have been widely adopted in many applications.
If you need assistance in selecting a fan, please feel free to contact us.
At SANYO DENKI, we offer a wide lineup of Splash Proof Fans to meet the requirements of various applications and equipment.

- Features waterproof and dustproof performance with IP68, IP55, and IP54 ratings.
-Our lineup includes the Splash Proof Long Life Fan (9WL type), designed for an expected service life of approximately 20 years (180,000 hours)*.
* Indoor environment, L10: 90% survival rate, 60°C, rated voltage, continuous operation, free-air condition


- They feature waterproof and dustproof performance with protection ratings of IP68, IP55, and IP54.
- Discharge air in a centrifugal direction, allowing efficient cooling and ventilation across different devices, including those with restricted internal space.


- They feature waterproof and dustproof performance with protection ratings of IP68.
- Air is drawn in along the axis and discharged at an almost perpendicular angle.
- High static pressure makes these fans suitable for intake and exhaust in systems where airflow resistance is considerable.


- They feature waterproof and dustproof performance with protection ratings of IP56, and IP68.
- Equipped with an integrated AC-DC converter, the fans run directly on AC power, eliminating the need for a DC supply. This design provides DC fan benefits, including reduced power consumption and extended lifespan, while operating from AC.
-The lineup features Splash Proof ACDC Axial Fan models and Splash Proof Centrifugal ACDC Fan.


- Features waterproof and dustproof performance with IP68 rating.
- Maximum airflow and static pressure have been enhanced over the conventional 9WP type.
- PWM control function enables precise fan speed regulation, which helps achieve low-noise operation and energy savings for the system.
January 2025 release: 120x25mm, Splash Proof Fan with Industry-Leading High Static Pressure
Suitable for environments where high waterproof and dustproof performance is essential, such as EV charging stations, battery storage units, solar inverters, digital signage systems, and plant factories.

Over the years, SANYO DENKI has applied its advanced technologies to make fans more resistant to harsh environments, including improved waterproof protection.For installation challenges, contact us anytime.
Supervised by: Ryuji Ueki, Group Manager, San Ace Group, Sales Division, SANYO DENKI CO., LTD.
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