Introduction
This user manual provides essential information for the safe and efficient installation, operation, and maintenance of your Fantech FG4 4" Duct 135 CFM Inline Centrifugal Fan. Please read this manual thoroughly before installation and retain it for future reference.

Image: The Fantech FG4 4-inch inline centrifugal fan, featuring a silver metallic housing and a black electrical box attached to its side. This fan is designed for duct installation.
Safety Information
- Always disconnect power before servicing or cleaning the unit.
- Installation must be performed by a qualified electrician in accordance with all local and national electrical codes.
- Do not use this fan with any solid-state speed control device unless specifically designed for it.
- Ensure proper grounding to reduce the risk of electric shock.
- Keep foreign objects away from the fan blades.
- This fan is for indoor use only.
Setup and Installation
The Fantech FG4 fan is designed for inline duct installation. Follow these steps for proper setup:
- Mounting Location: Select a suitable location in the ductwork that allows for easy access for maintenance and provides adequate space around the fan for airflow. The fan can be mounted at any angle.
- Duct Connection: Connect the fan to 4-inch diameter ductwork using appropriate clamps or tape to ensure an airtight seal.
- Electrical Wiring:
- Ensure power is disconnected at the circuit breaker before wiring.
- Connect the fan's electrical wires to the power supply according to the wiring diagram provided inside the fan's junction box cover.
- The fan operates on 12 Volts. Verify your power supply matches this requirement.
- All wiring must comply with local and national electrical codes (e.g., NEC).
- Testing: Once installed and wired, restore power and test the fan's operation.
Operating Instructions
The Fantech FG4 fan is designed for continuous or intermittent operation to move air through duct systems. It can be controlled via a standard wall switch or a compatible remote control system (if applicable and purchased separately).
- Power On/Off: Use the connected wall switch or remote control to turn the fan on or off.
- Airflow Direction: Ensure the fan is installed with the airflow arrow on the casing pointing in the desired direction of air movement.
- Speed Control: If a compatible speed controller is installed, adjust the fan speed as needed. The fan supports 3 power levels if controlled by a compatible device.
Maintenance
Regular maintenance ensures optimal performance and longevity of your Fantech FG4 fan.
- Power Disconnection: Always disconnect power to the fan at the circuit breaker before performing any maintenance.
- Cleaning Fan Blades:
- Periodically inspect the fan blades for dust and debris accumulation.
- Carefully wipe the blades with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Ensure blades are dry before restoring power.
- Motor Lubrication: The fan motor is permanently lubricated and requires no additional lubrication.
- Ductwork Inspection: Periodically check the ductwork connected to the fan for any blockages or leaks that could impede airflow.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Fan does not operate | No power supply Loose wiring Motor malfunction | Check circuit breaker and power switch Verify all electrical connections are secure (with power off) Contact Fantech support if motor is faulty |
| Reduced airflow | Blocked ductwork Dirty fan blades Incorrect fan speed setting | Inspect and clear duct obstructions Clean fan blades (see Maintenance section) Adjust speed controller if applicable |
| Excessive noise | Loose mounting Debris in fan Damaged fan blades | Ensure fan is securely mounted Inspect and remove any debris Contact Fantech support if blades are damaged |
Specifications
| Feature | Detail |
|---|---|
| Model Name | FG4 |
| Brand | FANTECH |
| Duct Size | 4 inches |
| Air Flow Capacity | 135 Cubic Feet Per Minute (CFM) |
| Power Source | Corded Electric |
| Voltage | 12 Volts |
| Indoor/Outdoor Usage | Indoor |
| Certifications | CSA, UL |
| Material | Plastic (Blades), Metallic (Housing) |
Warranty and Support
Fantech products are manufactured to the highest standards and are backed by a limited warranty. For specific warranty details, please refer to the warranty card included with your product or visit the official Fantech website.
For technical support, replacement parts, or warranty claims, please contact Fantech customer service:
- Website: www.fantech.net
- Phone: Refer to Fantech's official website for current contact numbers.
When contacting support, please have your product model number (FG4) and purchase date available.





