1. Introduction
This manual provides essential information for the safe and efficient operation of your VEVOR 4-Inch 200 CFM Inline Duct Fan with Variable Speed Controller. Please read these instructions thoroughly before installation and use, and retain them for future reference.
The VEVOR Inline Duct Fan is designed to improve airflow and ventilation in various environments, including grow tents, hydroponic rooms, electronic equipment rooms, kitchens, and basements. It features a quiet AC motor and a variable speed controller for precise airflow management.

2. Safety Information
Always follow basic safety precautions to reduce the risk of fire, electric shock, and injury to persons.
- Ensure the power supply matches the fan's voltage requirements (120 Volts AC).
- Do not operate the fan with a damaged cord or plug.
- Avoid contact with moving parts.
- Do not immerse the fan in water or other liquids.
- Disconnect power before servicing or cleaning.
- Install the fan in a location where it is not exposed to excessive moisture or extreme temperatures.
- Keep children and pets away from the operating fan.
3. Package Contents
Verify that all items are present and in good condition upon unpacking.
- VEVOR 4-Inch Inline Duct Fan
- Variable Speed Controller (integrated with power cord)
- Hang-up Slings
- Non-vibration Rubber Mats
- Mounting Hardware (screws, anchors)
- User Manual

4. Setup and Installation
The VEVOR Inline Duct Fan offers flexible installation options, including hanging or wall-mounting.
4.1 Mounting Options
The fan can be mounted using the provided hang-up slings or secured to a surface using the mounting hardware.
- Hanging Installation: Use the hang-up slings to suspend the fan from a suitable support structure. Ensure the slings are securely fastened and the fan is stable.
- Wall-Mounting: The fan's base can be detached for easier mounting. Unscrew the pins on the side of the fan to separate the main fan body from the mounting base. Secure the mounting base to your desired surface using the provided screws and anchors. Once the base is secure, reinsert the fan body and fasten the pins. The non-vibration rubber mats can be placed between the fan and the mounting surface to reduce noise.

4.2 Ducting Connection
Connect appropriate 4-inch ducting to both ends of the inline fan. Ensure a tight seal using duct clamps (not included) to prevent air leakage and maximize efficiency. The fan features an airflow arrow indicating the direction of air movement.

4.3 Installation Video Guide
Video 1: This video demonstrates the unboxing, components, and installation process of the VEVOR Inline Duct Fan, including how to separate the fan from its mounting base and connect ducting.
5. Operating Instructions
The VEVOR Inline Duct Fan is equipped with a variable speed controller for easy adjustment of airflow.
5.1 Powering On/Off and Speed Control
- Plug the fan's power cord into a standard 120V AC outlet.
- Use the manual knob on the integrated speed controller to turn the fan ON or OFF and adjust the fan speed. Rotate the knob clockwise to increase speed and counter-clockwise to decrease speed.
- The fan provides sufficient airflow of 200 CFM, suitable for various ventilation and dehumidification needs.


5.2 Quiet Operation
The fan is equipped with a high-quality AC motor designed for strong power at a low noise level of 29 dB, ensuring minimal disturbance during operation.

5.3 Product Overview Video
Video 2: This video provides a general overview of the VEVOR Inline Duct Fan, showcasing its features and applications.
6. Maintenance
Regular maintenance ensures optimal performance and extends the lifespan of your fan.
6.1 Cleaning
- Disconnect the fan from the power source before cleaning.
- Periodically inspect the fan blades and housing for dust and debris accumulation.
- To clean, unscrew the pins on the side of the fan to separate the fan body from the mounting base. Carefully remove the fan impeller.
- Wipe the fan blades and interior surfaces with a soft, damp cloth. Ensure all parts are completely dry before reassembling.
- Do not use abrasive cleaners or solvents.

7. Troubleshooting
If you encounter issues with your VEVOR Inline Duct Fan, refer to the following common problems and solutions:
- Fan does not turn on:
- Check if the power cord is securely plugged into a working outlet.
- Ensure the speed control knob is turned to an ON position.
- Insufficient airflow:
- Verify that the fan speed is set to a higher setting using the controller.
- Check for any obstructions in the ducting or around the fan intake/exhaust.
- Ensure ducting connections are sealed properly to prevent air leaks.
- Excessive noise:
- Ensure the fan is securely mounted and not vibrating against any surfaces. Use the provided rubber mats if wall-mounted.
- Check for loose components or debris inside the fan housing.
7.1 Airflow Demonstration Video
Video 3: This video demonstrates the airflow capabilities of the VEVOR Inline Duct Fan in an operational setting.
8. Specifications
| Feature | Specification |
|---|---|
| Product Dimensions | 12"L x 7.5"W x 9.3"H |
| Brand | VEVOR |
| Power Connector Type | 2-Pin |
| Voltage | 120 Volts (AC) |
| Wattage | 31 watts |
| Cooling Method | Air |
| Compatible Devices | Desktop, Electronic Components, Laptop |
| Noise Level | 29 Decibels |
| Material | Plastic |
| Maximum Rotational Speed | 2550 RPM |
| Air Flow Capacity | 200 Cubic Feet Per Minute |
| Item Weight | 1.9 Kilograms |
9. Warranty and Support
For warranty information and customer support, please refer to the official VEVOR website or contact their customer service directly. Keep your purchase receipt for any warranty claims.
Visit the VEVOR Store: VEVOR Official Store