1. Safety Information
Please read and understand all instructions before beginning installation. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Always disconnect power at the circuit breaker before installing or servicing the fan.
- All wiring must be performed by a qualified electrician in accordance with all applicable electrical codes and standards.
- Ensure the fan is properly grounded.
- Do not install this fan in a ceiling with insulation that exceeds R-50.
- This fan is intended for general ventilating use only. Do not use to exhaust hazardous or explosive materials and vapors.
- Verify that the voltage and frequency of your power supply match the specifications on the fan's label.
2. Package Contents
Verify that all components are present and undamaged before installation.
- Integrated Fan Housing (1)
- Grille and LED Light (1)
- Check Valve (1)
- Screws (12)
- Installation Manual (1)

Image: Contents of the FASDUNT Bathroom Exhaust Fan package, including the fan housing, grille with LED light, check valve, screws, and manual.
3. Specifications
| Brand | FASDUNT |
| Model Name | KB1S (KEFDKB001-F5) |
| Air Flow Capacity | 110 CFM (Cubic Feet Per Minute) |
| Noise Level | 1.0 Sones |
| Wattage | 45 Watts (Total) |
| Light Power | 15 Watts LED |
| Voltage | 110 Volts |
| Product Dimensions | 10.24"D x 10.24"W x 6.89"H |
| Ceiling Opening Size | 10.43" x 10.43" (26.5cm x 26.5cm) |
| Certification | ETL Listed |
4. Installation
This fan is designed for easy installation. Ensure you have the necessary tools and follow these steps carefully. For visual guidance, refer to the official installation video provided by FASDUNT.
Video: Official FASDUNT Bathroom Exhaust Fan with Light Installation Guide. This video demonstrates the step-by-step process for installing the fan, including preparing the ceiling opening, wiring, and securing the unit.
4.1 Prepare the Ceiling Opening
- Ensure power is disconnected at the circuit breaker.
- Measure and cut a ceiling opening of 10.43 x 10.43 inches (26.5 x 26.5 cm).
- Clear any insulation or obstructions from the installation area.

Image: Diagram showing the dimensions of the FASDUNT fan and the required ceiling opening size for installation.
4.2 Mount the Fan Housing
- Insert the integrated fan housing into the prepared ceiling opening.
- Secure the housing to the ceiling joists or appropriate support structure using the provided screws.
4.3 Connect Ductwork
- Attach the check valve to the fan's exhaust port.
- Connect the ductwork (not included) to the exhaust port and secure it with foil tape or a clamp to ensure an airtight seal.
4.4 Electrical Wiring
- Route the electrical wiring from the power supply to the fan housing.
- Connect the wires according to the wiring diagram in the included manual. The fan and light can be wired to operate simultaneously or separately, depending on your switch configuration.
- Ensure all connections are secure and insulated with wire nuts.
4.5 Install Grille and LED Light
- Connect the LED light's power cable to the corresponding connector inside the fan housing.
- Attach the grille with the LED light to the fan housing by aligning the clips and pushing firmly until it snaps into place.
5. Operating Instructions
The FASDUNT Bathroom Exhaust Fan with LED Light is designed for simple operation via your wall switch.
- Fan Operation: If wired to a dedicated switch, simply toggle the switch to turn the fan ON or OFF. The fan will effectively remove humidity and odors from the room.
- LED Light Operation: If wired to a dedicated switch, toggle the switch to turn the LED light ON or OFF. The 15W LED light provides bright illumination.
- Combined Operation: If wired to a single switch for both fan and light, both functions will activate simultaneously when the switch is toggled.

Image: The FASDUNT Bathroom Exhaust Fan with LED Light installed in a bathroom ceiling, demonstrating its quiet and efficient operation.
6. Maintenance
Regular maintenance ensures optimal performance and longevity of your FASDUNT exhaust fan.
- Cleaning the Grille: Periodically remove the grille and wipe it with a damp cloth. Do not use abrasive cleaners.
- Cleaning the Fan Blades: With power disconnected, gently wipe the fan blades with a damp cloth to remove dust and debris. Ensure blades are dry before restoring power.
- Motor Lubrication: The fan motor is permanently lubricated and does not require additional oiling.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Fan does not operate. | No power supply; loose wiring; faulty switch. | Check circuit breaker. Verify wiring connections. Test or replace switch. |
| Light does not turn on. | No power supply to light; loose LED connector; faulty LED module. | Check circuit breaker. Ensure LED connector is securely plugged in. Contact customer support if LED module is faulty. |
| Fan is noisy. | Loose mounting screws; debris in fan blades; motor issue. | Tighten mounting screws. Clean fan blades. If noise persists, contact customer support. |
| Poor ventilation. | Obstructed ductwork; improper duct size; check valve stuck. | Inspect ductwork for obstructions. Ensure correct duct size is used. Check if the check valve is operating freely. |
8. Warranty and Support
For warranty information, technical support, or replacement parts, please contact FASDUNT customer service. Refer to the contact details provided in your original purchase documentation or visit the official FASDUNT website.
Online Store: FASDUNT Store on Amazon