Introduction
The LEVOIT NeoClassic 450S Smart Humidifier is designed to enhance your indoor environment by providing optimal humidity levels. This 4.2-liter top-fill cool mist humidifier is suitable for large rooms, offering quiet operation and smart controls for a comfortable living space. Its easy-clean design ensures convenient maintenance.

Image: The LEVOIT NeoClassic 450S Smart Humidifier operating on a nightstand, demonstrating its mist output and digital display.
Safety Information
Before operating your humidifier, please read and understand all safety instructions. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Always place the humidifier on a firm, flat, water-resistant surface away from walls and heat sources.
- Use only purified or distilled water to prevent white dust and mineral buildup.
- Do not immerse the base in water or other liquids.
- Unplug the humidifier before cleaning, refilling, or moving it.
- Keep out of reach of children and pets.
Product Components
Familiarize yourself with the main parts of your humidifier:

Image: An exploded diagram illustrating the main components of the LEVOIT humidifier, including the cover, water tank, detachable sink, and base.
- Cover: Top part that secures the water tank.
- Water Tank: Holds the water for humidification.
- Detachable Sink: The inner basin that collects water and is removable for cleaning.
- Base: Contains the electronic components and control panel.
Setup
Follow these steps for initial setup:
- Unpack: Carefully remove all packaging materials and place the humidifier on a flat, stable surface.
- Initial Cleaning: Before first use, clean all components as described in the 'Maintenance and Cleaning' section.
- Fill Water Tank: Remove the top cover. Fill the water tank with purified or distilled water up to the MAX line. The top-fill design allows for easy refilling.
- Replace Cover: Securely place the top cover back onto the water tank.
- Connect Power: Plug the power adapter into a wall outlet.

Image: A hand pouring water directly into the top of the LEVOIT humidifier's water tank, demonstrating the easy top-fill feature.
Operating Instructions
Your LEVOIT Smart Humidifier offers various modes and settings for customized comfort.
Basic Operation
- Power On/Off: Press the power button on the control panel or use the VeSync app.
- Adjust Mist Output: Cycle through low, medium, and high mist settings using the mist button on the device or the app.
Smart Features (VeSync App & Voice Control)
Download the VeSync app to unlock advanced features and remote control.

Image: A user interacting with the VeSync smartphone application to set the target humidity level for the LEVOIT humidifier.
- Auto Mode: Set your desired humidity level (e.g., 40%–60%). The humidifier will automatically adjust mist output to maintain this level.
- Night Light: Customize the soft, blue light-free night light for a peaceful sleep environment. Adjust brightness and color temperature via the app.
- Soothing Sounds: Access various soothing sounds (e.g., summer rain, sea wave, birdsong) through the VeSync app to enhance relaxation.
- Custom Scenes: Create personalized settings for different activities like meditation, focusing, or yoga, combining humidity, light, and sound.
- Voice Control: Integrate with smart home assistants for hands-free operation.

Image: The LEVOIT humidifier on a nightstand, with an overlay showing the VeSync app interface for adjusting night light brightness, color temperature, volume, and selecting soothing sounds.
Aromatherapy Function
Add essential oils to the dedicated aroma chamber for a pleasant fragrance.
- Locate the aroma chamber on the humidifier.
- Add 3-5 drops of essential oil directly into the chamber. Do not add excessive amounts.
- The mist will diffuse the aroma into the air.

Image: A hand carefully dropping essential oil into the designated aromatherapy compartment of the humidifier.
Product Overview Video
Video: This video provides a brief overview of the Levoit NeoClassic 450S Smart Humidifier, showcasing its design and basic operation.
Maintenance and Cleaning
Regular cleaning is essential for optimal performance and hygiene. The NeoClassic 450S is designed for easy cleaning.
Dishwasher-Safe Components
The detachable sink and water tank cover are dishwasher-safe for convenient cleaning.

Image: The detachable sink and water tank cover of the LEVOIT humidifier placed in a dishwasher rack, highlighting their dishwasher-safe feature.
- Do not use dishwasher settings above 70°C (158°F).
- Use a neutral cleaner (pH 6–7); avoid strong acidic or alkaline cleaners.
- Wash with water only; do not use dishwasher detergent or other cleaning agents on these parts.
Manual Cleaning Steps
For other parts or manual cleaning:

Image: A visual guide showing the steps to disassemble the humidifier for cleaning: emptying water, rotating the knob to remove the sink, lifting the detachable sink, and wiping the base.
- Empty Water: Always empty any remaining water from the tank and base before cleaning.
- Disassemble: Remove the cover and detachable sink.
- Wipe Base: Use a soft cloth to wipe the inside of the base.
- Descaling: To remove mineral buildup, fill the tank with a mixture of equal parts white vinegar and water. Let it soak for 30 minutes, then scrub with a soft brush and rinse thoroughly.
- Frequency: Clean your humidifier at least once a week, or more frequently if used daily or with hard water.
Cleaning Guide Video
Video: Watch this video for a detailed guide on how to easily clean and maintain your Levoit NeoClassic Humidifier, including instructions for dishwasher-safe parts.
Troubleshooting
Here are solutions to common issues you might encounter:
| Problem | Possible Cause | Solution |
|---|---|---|
| White dust around humidifier | Using hard tap water. | Use purified or distilled water. Clean the humidifier regularly to remove mineral buildup. |
| Humidifier not producing mist | No water in tank; unit not plugged in; mist outlet blocked. | Refill water tank; ensure power connection; check for and clear any obstructions. |
| Humming noise during operation | Mineral buildup; unit not on a flat surface. | Clean the humidifier thoroughly. Ensure it is placed on a stable, flat surface. |
| Humidity level not increasing sufficiently in large rooms | Room size exceeds effective range; drafts; open windows/doors. | Ensure the room size is within the humidifier's effective range (up to 432 sq ft). Close windows and doors to minimize humidity loss. Consider optimal placement for mist distribution. |
| Automatic shut-off not working | Sensor malfunction; water level sensor obstructed. | Ensure the water level sensor is clean and unobstructed. If the issue persists, contact customer support. |
Specifications
Detailed technical specifications for the LEVOIT NeoClassic 450S Smart Humidifier:
- Model Name: NeoClassic 450S
- Model Number: LUH-N451S-WUS
- Capacity: 4.2 Liters
- Floor Area Coverage: Up to 432 square feet
- Mist Output: 270 mL/h
- Dimensions (D x W x H): 8.1" x 8.1" x 12.8"
- Item Weight: 4 pounds
- Operation Mode: Ultrasonic
- Wattage: 25 Watts
- Voltage: 100-240 Volts
- Noise Level: 21-26 dB (Whisper-Quiet Operation)
- Special Features: Aroma Diffuser, Auto Mode, Auto Shut Off, Dishwasher Safe (Detachable Sink and Water Tank Cover), Night Light, Remote Control, Timer, Voice Control
- Material: Food grade materials
Warranty and Support
Your LEVOIT NeoClassic 450S Smart Humidifier comes with a warranty. Please refer to the included Warranty Card for detailed terms and conditions. For further assistance, troubleshooting, or to access the full user manual, please visit the official Levoit support website or contact their customer service.
A physical User Manual and Warranty Card are included with your purchase.







