1. Introduction
The Manrose MF100T is a 100mm inline mixed flow extractor fan designed for applications requiring high airflow and low noise levels, typically in bathrooms. This model includes an adjustable run-on timer function, allowing the fan to continue operating for a pre-set duration after the main light switch is turned off. It is suitable for use with both rigid and flexible 100mm diameter ducting.
The fan features high-quality ball bearing motors, rated for a minimum of 30,000 hours or 3 years of continuous operation. It offers three speed settings, which are selected via an internal dip switch during installation.
Figure 1: Manrose MF100T 100mm Inline Bathroom Extractor Fan. This image shows the compact, cylindrical design of the fan unit, suitable for in-duct installation.
2. Safety Information
Important: Read all instructions carefully before installation and operation. Retain this manual for future reference.
- Installation must be carried out by a qualified electrician in accordance with current wiring regulations and building codes.
- Ensure the power supply is disconnected at the mains before commencing any installation, maintenance, or cleaning.
- This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.
- Children should be supervised to ensure that they do not play with the appliance.
- Do not operate the fan if any part is damaged.
- The fan is designed for indoor use only and should not be exposed to direct water spray or extreme temperatures.
- This product is Class II double insulated, meaning no earth connection is required for the unit itself. However, all wiring must comply with local regulations.
3. Setup and Installation
3.1 Unpacking
Carefully remove the fan unit from its packaging. Inspect for any signs of damage. The box should contain the MF100T fan unit and this instruction manual.
3.2 Mounting
The MF100T fan can be mounted in various positions within a ducting system (e.g., in a loft space, ceiling void, or wall cavity). It is suitable for use with 100mm diameter rigid or flexible ducting. The fan assembly is designed for easy removal from rigid ducting installations for maintenance.
- Secure the fan unit firmly to a stable surface using appropriate fixings. Avoid mounting directly to rafters without vibration isolation to minimize noise transmission.
- Connect the 100mm ducting to both inlet and outlet spigots of the fan. Ensure all connections are airtight using duct tape or appropriate clamps to maintain optimal performance and prevent air leakage.
3.3 Electrical Connection
WARNING: Electrical installation must be performed by a qualified electrician. Ensure power is isolated before proceeding.
The MF100T requires a permanent live, a switched live, and a neutral connection (3 wires excluding earth) at the fan position for the timer functionality to operate correctly. This typically involves connecting to a fused spur with a 3 Amp fuse and a contact separation of at least 3mm in all poles.
- Permanent Live (L): Provides continuous power to the fan's timer circuit.
- Switched Live (LS): Connects to the room's light switch. The fan activates when this live is present (light is on).
- Neutral (N): Common return path for the electrical circuit.
- Earth: Not required for the fan unit itself as it is Class II double insulated.
Use solid core wiring of at least 1mm². Ensure terminals are securely tightened.
3.4 Speed Settings Adjustment
The fan has three speed settings (Low, Medium, High). These are selected via an internal dip switch located within the wiring compartment. To change the speed setting:
- Ensure power to the fan is disconnected at the mains.
- Open the wiring compartment cover (usually secured by screws).
- Locate the dip switch. Refer to the internal diagram or markings for specific switch positions corresponding to Low, Medium, and High speeds.
- Adjust the dip switch to the desired speed setting.
- Close the wiring compartment cover securely before restoring power.
3.5 Timer Adjustment
The run-on timer can be adjusted to control how long the fan continues to operate after the switched live supply is removed (e.g., when the room light is turned off). The timer setting is typically adjusted via a small potentiometer (rotary dial) inside the wiring compartment.
- Ensure power to the fan is disconnected at the mains.
- Open the wiring compartment cover.
- Locate the timer adjustment dial. It may not have precise markings, requiring trial and error to achieve the desired run-on time.
- Use a small screwdriver to carefully turn the dial. Turning clockwise usually increases the time, and counter-clockwise decreases it.
- Close the wiring compartment cover securely before restoring power and testing the timer.
4. Operating Instructions
The Manrose MF100T fan is designed for automatic operation in conjunction with your room's lighting circuit.
- Fan Activation: When the room light switch is turned ON, the fan will start operating at the pre-selected speed.
- Timer Function: When the room light switch is turned OFF, the fan will continue to run for the duration set on its adjustable run-on timer. After the set time has elapsed, the fan will switch off automatically.
This functionality ensures effective ventilation and moisture removal even after the room is vacated, helping to prevent dampness and condensation.
5. Maintenance
Regular cleaning and maintenance will ensure the longevity and optimal performance of your Manrose MF100T fan.
- Power Disconnection: Always ensure the power supply to the fan is completely disconnected at the mains before attempting any cleaning or maintenance.
- Exterior Cleaning: Wipe the exterior surfaces of the fan unit with a soft, damp cloth. Do not use abrasive cleaners, solvents, or harsh chemicals.
- Impeller Cleaning: Periodically, it may be necessary to clean the fan impeller blades to remove dust and debris buildup, which can reduce efficiency and increase noise.
- Disconnect power.
- Carefully remove the fan assembly from the ducting (if installed with easy-removal features).
- Gently clean the impeller blades with a soft brush or cloth. Avoid bending or damaging the blades.
- Reassemble the fan, ensuring all connections are secure.
- Ducting Inspection: Periodically check the ducting for any blockages, damage, or excessive dust accumulation. Clean or repair as necessary.
6. Troubleshooting
If you experience issues with your Manrose MF100T fan, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Fan does not start when light is switched on. | No power supply; incorrect wiring; faulty light switch; internal fault. |
|
| Fan runs continuously and does not switch off. | Timer set to maximum; faulty timer circuit; switched live always active. |
|
| Fan is excessively noisy. | Loose mounting; debris in impeller; damaged impeller; ducting issues. |
|
| Fan performance is poor (low airflow). | Incorrect speed setting; blocked ducting; dirty impeller; air leakage. |
|
7. Specifications
| Feature | Detail |
|---|---|
| Brand | Manrose |
| Model | MF100T |
| Duct Diameter | 100 mm |
| Air Flow Capacity (Max) | 245 Cubic Metres Per Hour (68 litres per second) |
| Noise Level (Max) | 25 Decibels (at 3m) |
| Wattage | 25 watts |
| Number of Speeds | 3 (selectable via dip switch) |
| Motor Type | Ball Bearing, Long Life |
| Product Dimensions (D x W x H) | 20D x 31W x 25H centimetres |
| Material | Plastic |
| Electrical Safety | Class II - Double Insulation (No Earth Required) |
| Compliance | BEAB Approved, CE Approved |
| Special Features | High Velocity, Built-in Run-on Timer |
8. Warranty & Support
8.1 Warranty
The Manrose MF100T fan is warranted for a minimum of 3 years from the date of purchase, covering defects in materials and workmanship. This warranty is valid provided the unit has been installed and operated in accordance with the instructions in this manual and local electrical regulations. Please retain your proof of purchase for warranty claims.
The warranty does not cover damage caused by improper installation, misuse, neglect, unauthorized repairs, or normal wear and tear.
8.2 Technical Support
For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact Manrose customer support. Contact details can typically be found on the official Manrose website or on your product packaging.
