MERTTURM Rechargeable USB Desk Fan ZH57 User Manual

1. Introduction

Thank you for purchasing the MERTTURM Rechargeable USB Desk Fan. This manual provides important information regarding the safe operation, installation, maintenance, and troubleshooting of your fan. Please read this manual thoroughly before use and retain it for future reference.

2. Safety Instructions

• Do not insert fingers or any objects into the fan grille when the fan is operating.
• Keep the fan away from water or other liquids to prevent electric shock.
• Do not use the fan in high humidity environments such as bathrooms without proper ventilation.
• Ensure the power source matches the voltage requirements specified in this manual.
• Unplug the fan before cleaning or performing any maintenance.
• Do not attempt to disassemble or repair the fan yourself. Contact qualified service personnel for repairs.
• Keep out of reach of children and pets.
• Avoid blocking the air inlet or outlet during operation.

3. Package Contents

Please check the package for the following items:

• 1 x MERTTURM Rechargeable USB Desk Fan
• 1 x Adhesive Hook (for wall mounting)
• 1 x USB-C Charging Cable
• 1 x User Manual

4. Product Overview

The MERTTURM ZH57 fan features a compact design with advanced airflow technology and user-friendly controls.

Figure 4.1: Internal components and airflow design. This image illustrates the brushless DC motor, the HD screen, and the turbo air outlet, emphasizing the fan's high-power airflow with 115 CFM max air circulation and 4.8 m/s max speed.

Key features include:

• Brushless DC Motor: Provides efficient and powerful airflow.
• HD Digital Display: Clearly shows current speed settings.
• 7 Bionic Blades: Designed for consistent air movement with reduced noise.
• Ultra-Quiet Operation: Operates at a low noise level of 30 dB, suitable for bedrooms and offices.

Figure 4.2: Quiet operation. The fan produces a whisper-quiet breeze at 30dB, making it ideal for use during sleep. The image also highlights the 7 bionic blades designed for efficient and silent airflow.

5. Setup

The fan can be used freestanding on a desk or table, or mounted on a wall.

5.1 Freestanding Placement

Place the fan on a stable, flat surface. Ensure there is adequate space around the fan for optimal airflow.

5.2 Wall Mounting

The fan includes a wall mounting hole design and an adhesive hook for convenient placement.

1. Choose a suitable, clean, and dry wall surface for mounting.
2. Attach the adhesive hook firmly to the desired location on the wall.
3. Align the wall mounting hole on the fan's base with the hook and securely hang the fan.

Figure 5.1: Wall mounting and 360° rotation. The fan can be easily mounted on a wall using the integrated hole design, providing flexible cooling options. It also features 360-degree vertical rotation to direct airflow precisely.

6. Operating Instructions

6.1 Power On/Off

To turn the fan ON or OFF, press and hold the power button (indicated by a circle with a vertical line) on the control panel for 2 seconds.

6.2 Speed Adjustment

The fan offers 100 precise, stepless speed settings, along with 5 preset speeds for quick selection.

• Preset Speeds: Briefly press the speed adjustment button (indicated by '+' or '-') to cycle through 5 fixed speeds (20, 40, 60, 80, 100).
• Stepless Speed Control: Press and hold the speed adjustment button to continuously increase or decrease the fan speed from 1 to 100. Release the button when the desired speed is reached.

Figure 6.1: Control panel and digital display. The clear digital screen shows the current speed and battery status. Touch controls allow for easy power on/off (hold for 2 seconds) and speed adjustments.

Figure 6.2: Stepless speed control and battery life. This image demonstrates the fan's ability to adjust speed from 1 to 100, offering precise control. It also provides an overview of battery life at various speed settings: 11 hours at 1st gear, 8.5 hours at 20th gear, 6.5 hours at 40th gear, 5.5 hours at 60th gear, 4.5 hours at 80th gear, and 4 hours at 100th gear.

6.3 360° Rotation

The fan head can be manually rotated 360 degrees vertically, allowing you to direct the airflow precisely where needed.

6.4 Charging

The fan is equipped with a built-in 4000 mAh rechargeable battery and supports USB-C fast charging.

• Connect the provided USB-C cable to the fan's charging port and to a compatible USB power adapter (not included).
• A full charge takes approximately 3 hours.
• The fan can operate for up to 11 hours on the lowest speed setting on a single charge.

Figure 6.3: Battery life and charging. The fan features an ultra-long battery life of up to 11 hours thanks to its 4000mAh rechargeable battery, which fully charges in approximately 3 hours.

Figure 6.4: USB-C fast charging details. This diagram provides a summary of the fan's charging capabilities, including its 4000mAh battery, 3-hour full charge time, and the included 1-meter USB-C cable.

7. Maintenance

7.1 Cleaning

• Always unplug the fan before cleaning.
• Use a soft, damp cloth to wipe the exterior surfaces of the fan.
• Do not use abrasive cleaners or solvents, as they may damage the fan's finish.
• For cleaning the fan blades, use a dry cloth or a soft brush to gently remove dust. Do not attempt to remove the front grille.

7.2 Storage

When not in use for extended periods, store the fan in a cool, dry place, away from direct sunlight and extreme temperatures.

8. Troubleshooting

9. Specifications

10. Warranty and Support

MERTTURM products are designed and manufactured to the highest quality standards. For warranty information or technical support, please refer to the warranty card included with your purchase or contact the seller directly. Please have your model number (ZH57) and purchase details ready when contacting support.