Reversible Fan Solution for Smart Toilets | News

NEWS Technical Support

Mar 2026

Technical Support

Reversible Fan Solution for Smart Toilets

As demand for hygiene and comfort rises, smart toilets are becoming a mainstream smart home essential. X Fan provides efficient fan solutions to support integrated functions and reliable airflow performance.

1. Development Background

In conventional smart toilets, deodorization and drying functions typically rely on two separate fans, resulting in:

Crowded internal space
Increased cost
Limited airflow performance
Maintenance difficulties

This solution adopts a 40×28 mm high-efficiency slim fan as its core and incorporates reversible airflow switching technology to achieve:

Dual functions with a single fan
Reduced internal space usage
Improved airflow efficiency
Lower overall system cost

2. System Architecture (User Perspective)

From the user's perspective, only two function buttons are visible: Deodorization and Drying. Internally, both functions are achieved through a single 40×28 mm fan by changing its rotation direction to control different airflow paths.

3. Working Principle

▶ Deodorization Mode (Fan CW → Air Intake)

During Use (Deodorization Mode):
The fan rotates CW, drawing air from inside the toilet. The air is purified and then discharged.
User Experience:
Odor-free, near-silent operation, with no noticeable airflow.
Key Design:
Airflow is confined to the deodorization path.

▶ Drying Mode (Fan CCW → Air Output)

During Drying Mode:
The fan rotates CCW, drawing air from outside. The air is heated and expelled through the air outlet.
User Experience:
Warm airflow with concentrated air pressure. Adjustable airflow direction ensures more even drying.
Key Design:
Airflow is focused and directed.

4. Advantages of the 40×28 Fan

▶ This solution utilizes a 40×40×28 mm slim fan with the following advantages:

1. Compact size: Easily embedded into the rear housing or side chambers, enabling a slimmer overall design.
2. Reversible control capability: Supports PWM or single-phase driver IC for stable airflow direction switching.
3. High-speed performance: High RPM compensates for airflow limitations of smaller fans.
4. Low power consumption: Deodorization mode operates at low speed for energy-saving and quiet performance.

More information◆

5. Key Airflow Control Design

To ensure that airflow directions do not interfere with each other during reversal, the system incorporates:
✔ Airflow direction is switched using air pressure differences, without the need for an additional motor.
✔ Separate drying and deodorization channels, divided by an internal partition to prevent airflow backflow.

6. User Value

From the consumer's perspective, the benefits include:
✔ Quieter deodorization
✔ Stronger drying performance
✔ Shorter drying time
✔ More compact product size
✔ Potential for a more competitive price

7. Comparison with Traditional Dual-Fan Systems

8. Technical Feasibility

▶ 4When applying a 40×28 fan in smart toilets, the following factors should be considered:

Moisture and water resistance (IPX4 or above).
High-humidity durability testing for motor bearings.
Reversible operation lifespan testing.
Heat resistance validation under high-temperature drying conditions.
The fan speed can be customized between 10,000 and 22,000 RPM according to customer requirements.
Deodorization airflow ≥ 15.88 CFM.
Drying airflow ≥ 26.56 CFM.
Actual PQ performance will depend on system impedance and airflow design.

9. Conclusion

This solution integrates reversible fan technology, multi-angle airflow design, and a high-speed slim 40×28 fan to successfully create a high-efficiency airflow system that delivers dual functions with a single fan.
It enables:
1. Expansion into the sanitary market
2. Enhanced product value
3. Development of modular solutions
4. Establishment of dedicated smart toilet fan product lines

Reversible technology applies to models such as 6025 and 7530. Contact us for customized solutions.

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