Xiaomi Smart Air Purifier 4 Compact with Smart App Control

Xiaomi Smart Air Purifier 4 Compact with Smart App Control

The Xiaomi Smart Air Purifier 4 Compact (AC-M18-SC) is a compact smart air purifier designed for bedrooms, study rooms, children’s rooms and other smaller indoor spaces.

Despite its compact size, the purifier provides a particle CADR of up to 230 m³/h and is rated for an effective coverage area of 16–27 m² under Xiaomi’s stated calculation standard. Xiaomi also states that the purifier can support rooms up to 48 m² when calculated at 2 air changes per hour (ACPH).

The Xiaomi Smart Air Purifier 4 Compact combines 3-in-1 filtration, real-time air-quality monitoring, automatic purification, Sleep Mode and Xiaomi Home app control in a compact desktop/floor-standing design.

Common Indoor Air Problems

Indoor environments can contain different types of airborne pollutants, including:

• Dust
• PM2.5 and fine particles
• Pollen
• Pet hair and dander
• Smoke
• Household odors
• Other airborne allergens

A suitable air purifier can help filter airborne particles and improve the overall indoor air-cleaning environment.

Smart Solution for Cleaner Indoor Air

The Xiaomi Smart Air Purifier 4 Compact uses a particulate-matter sensor to monitor changes in indoor air quality and can automatically adjust purification speed in Auto Mode.

Its four-color air-quality indicator provides an easy visual indication of indoor air conditions, while Xiaomi Home allows users to control the purifier remotely from a smartphone.

Key Features

1. 230 m³/h Particle CADR

The Xiaomi Smart Air Purifier 4 Compact delivers a particle CADR of up to 230 m³/h, helping circulate and purify indoor air efficiently for its intended room size.

2. 3-in-1 Filtration

The purifier uses a three-layer filtration system consisting of:

• Pre-filter – helps capture larger particles.
• Xiaomi High Efficiency Filter – designed to capture fine airborne particles.
• Activated carbon – helps adsorb household odors and certain gaseous pollutants.

Xiaomi specifically describes the filtration system as a 3-in-1 solution.

3. 99.97% Filtration of 0.3μm Particles

Xiaomi states that the filter material used in this purifier achieved 99.97% filtration efficiency for 0.3μm particles under the cited testing conditions.

The manufacturer references China Testing & Inspection Institute for Household Electric Appliances report WCv-21-40115 for this result.

4. Real-Time Air Quality Monitoring

The built-in particulate-matter sensor monitors changes in indoor air quality.

A four-color indicator light provides an easy-to-understand visual representation of air quality.

5. Xiaomi Home App Control

The Xiaomi Smart Air Purifier 4 Compact supports smart control through the Mi Home/Xiaomi Home app.

Supported functions include features such as:

• Remote activation
• Purification setting adjustment
• Air-quality monitoring
• Timed on/off
• Child lock
• Filter replacement reminders

6. One-Touch Auto Mode

With its particulate-matter sensor, the purifier can automatically adjust purification speed based on detected air-quality changes.

This makes Auto Mode convenient for everyday use without manually changing the fan speed throughout the day.

7. Ultra-Quiet 20dB Sleep Mode

In Sleep Mode, Xiaomi states that noise can be as low as 20dB, allowing the purifier to operate quietly during nighttime use.

The display light can also be turned off in Sleep Mode.

8. Compact Desktop & Floor-Standing Design

The purifier measures approximately Φ220 × 355mm and weighs around 2.2kg.

Its compact design allows it to be used on a suitable tabletop or placed on the floor, making it easy to move between rooms.

9. Low Power Consumption

The purifier has a rated power of 27W. Xiaomi states that 24 hours of purification at the maximum rated output would consume approximately 0.7kWh based on its calculation.

10. Smart Voice Assistance

Supported regional versions can work with Google Home and Amazon Alexa through compatible smart voice devices.

Availability of voice-assistant functions depends on region and language.

Benefits

• Helps filter dust and fine airborne particles
• 3-in-1 filtration system
• Helps filter PM2.5 and pollen
• Activated carbon helps reduce household odors
• Real-time air-quality monitoring
• Automatic purification speed adjustment
• Xiaomi Home app control
• 20dB Sleep Mode
• Compact and lightweight design
• Low 27W rated power
• Suitable for bedrooms and study rooms

Perfect For

The Xiaomi Smart Air Purifier 4 Compact is particularly suitable for:

• Bedrooms
• Children’s bedrooms
• Study rooms
• Home offices
• Small apartments
• Workspaces
• Pet-owning households
• Dust-sensitive environments

Xiaomi specifically positions the model for scenarios such as bedrooms, children’s bedrooms and workspaces.

Why Choose Xiaomi Smart Air Purifier 4 Compact?

The biggest advantage of this model is its combination of compact design and smart purification features.

You get 3-in-1 filtration, PM2.5 sensing, Auto Mode, Xiaomi Home app control and an ultra-quiet Sleep Mode without needing a large floor-standing purifier.

For smaller rooms and personal spaces, the 230 m³/h CADR provides a strong balance between purification performance, size and energy consumption.

Xiaomi Smart Air Purifier 4 Compact vs Basic Air Purifier

How to Use Xiaomi Smart Air Purifier 4 Compact

Step 1: Choose the Right Location

Place the purifier on a stable surface with sufficient space around the air intake and outlet.

Step 2: Connect the Power

Connect the supplied power adapter and turn on the purifier.

The AC-M18-SC uses a 24V DC rated input, with its power adapter designed for 100–240V AC, 50/60Hz input.

Step 3: Select Auto Mode

Use Auto Mode for automatic adjustment based on detected particulate levels.

Step 4: Monitor Air Quality

Check the purifier’s indicator light to see changes in indoor air quality.

Step 5: Connect Xiaomi Home

Pair the purifier with the Xiaomi Home/Mi Home app to access supported smart features.

Step 6: Use Sleep Mode at Night

Select Sleep Mode for quieter operation. Xiaomi specifies noise as low as 20dB in this mode.

Step 7: Replace the Filter

Monitor filter status and replace the filter when the purifier or Xiaomi Home app indicates that replacement is required.

Recommended Use Cases

Bedroom

The compact size and 20dB Sleep Mode make it well suited to bedrooms.

Study Room

Use it in study or work areas to help manage indoor dust and fine airborne particles.

Children’s Room

The compact purifier can be used in children’s bedrooms or other suitable indoor spaces. Xiaomi also markets the product for allergy-sensitive users and children’s bedrooms.

Home Office

Use the purifier during working hours for continuous indoor air filtration.

Small Apartment

Its compact footprint makes it easier to position in apartments and smaller living spaces.

Cleaning & Maintenance

For proper maintenance:

• Keep the air inlet and outlet clear.
• Clean the external surfaces regularly.
• Keep the filter compartment free from excessive dust.
• Monitor filter life through the Xiaomi Home app where supported.
• Replace the filter when required.
• Do not wash the filter with water.
• Do not spray water directly onto the purifier.

Xiaomi’s manual specifically recommends using a vacuum cleaner or soft cloth to clean the filter compartment and warns against rinsing or directly spraying the purifier with water.

Cleaning the Particle Sensor

Xiaomi recommends cleaning the particle sensor approximately every six months using the prescribed dry-cleaning method. The manual warns not to use hot air for this cleaning process.

Important Usage Tips

• Keep the air intake and outlet unobstructed.
• Place the purifier on a stable surface.
• Keep the purifier away from direct water exposure.
• Use Auto Mode for convenient automatic purification.
• Use Sleep Mode during nighttime.
• Check the filter replacement reminder regularly.
• Keep the Xiaomi Home app updated where necessary.
• Verify your Wi-Fi network compatibility before setup.

The AC-M18-SC supports 2.4GHz Wi-Fi according to Xiaomi’s official specifications.

Product Specifications

*Xiaomi’s 99.97% filtration claim is based on the cited testing of the filter material for 0.3μm particles.

What’s in the Box?

According to Xiaomi’s specifications, the package includes:

• Xiaomi Smart Air Purifier 4 Compact × 1
• Filter × 1
• Power Cord/Adapter × 1
• User Manual × 1

Who Should Buy This Product?

The Xiaomi Smart Air Purifier 4 Compact is ideal for customers who want:

• A compact smart air purifier
• Xiaomi Home app control
• PM2.5 monitoring
• 3-in-1 filtration
• Quiet nighttime purification
• A purifier for bedrooms or study rooms
• Low power consumption
• Automatic purification
• A lightweight, portable design

Why Buy Xiaomi Smart Air Purifier 4 Compact from AIYOZON?

The Xiaomi Smart Air Purifier 4 Compact is a practical choice for customers who want smart air purification without taking up much space.

AIYOZON Benefits

• Authentic-product-focused sourcing
• Detailed product information
• Competitive pricing
• Convenient online ordering
• Reliable customer support
• Convenient delivery
• Carefully selected Xiaomi products

Frequently Asked Questions

What is the CADR of Xiaomi Smart Air Purifier 4 Compact?

The Xiaomi Smart Air Purifier 4 Compact has a particle CADR of 230 m³/h.

What room size is suitable for Xiaomi Air Purifier 4 Compact?

Xiaomi lists an effective coverage area of 16–27 m². It also states that the purifier can support up to 48 m² based on 2 air changes per hour (ACPH) under its specified assumptions.

Does Xiaomi Air Purifier 4 Compact have a HEPA filter?

The purifier uses Xiaomi’s High Efficiency Filter as part of its 3-in-1 filtration system. Xiaomi states that the filter material achieved 99.97% filtration efficiency for 0.3μm particles under its cited test conditions.

Does Xiaomi Smart Air Purifier 4 Compact remove PM2.5?

Yes. Its high-efficiency filtration system is designed to capture fine airborne particles, including PM2.5. Xiaomi also provides a particulate-matter sensor for monitoring air-quality changes.

Can I control Xiaomi Air Purifier 4 Compact with my phone?

Yes. The purifier supports remote control through the Mi Home/Xiaomi Home app.

Does it support Wi-Fi?

Yes. The AC-M18-SC supports 2.4GHz Wi-Fi for smart connectivity.

Is Xiaomi Air Purifier 4 Compact suitable for a bedroom?

Yes. Xiaomi specifically positions the purifier for bedroom and study use, and its Sleep Mode can operate at noise levels as low as 20dB under the manufacturer’s test conditions.

Does Xiaomi Air Purifier 4 Compact have Auto Mode?

Yes. Its particulate-matter sensor allows the purifier to automatically adjust purification speed in Auto Mode.

How much power does Xiaomi Air Purifier 4 Compact use?

The purifier has a 27W rated power. Xiaomi calculates approximately 0.7kWh of electricity consumption for 24 hours of purification at maximum rated output.

How often should I replace the filter?

Xiaomi’s product information lists a 6–12 month filter lifespan, depending on usage and environmental conditions. The Xiaomi Home app can provide replacement reminders.

Does Xiaomi Air Purifier 4 Compact support Alexa and Google Home?

Yes, compatible versions support Google Home and Alexa. Availability of voice-assistant functions can vary by region and language.

What is the weight of Xiaomi Smart Air Purifier 4 Compact?

The official specifications list the net weight at approximately 2.2kg.

Final Verdict

The Xiaomi Smart Air Purifier 4 Compact (AC-M18-SC) is a compact but capable smart air purifier designed for bedrooms, study rooms, children’s rooms and other smaller indoor spaces.

With 230 m³/h particle CADR, 3-in-1 filtration, 99.97% filtration of 0.3μm particles under Xiaomi’s cited test conditions, PM2.5 monitoring, Xiaomi Home app control and 20dB Sleep Mode, it offers a strong combination of smart features and compact design.

Its 27W rated power and approximately 2.2kg weight also make it practical for everyday home use and easy to move between suitable spaces.

Upgrade Your Indoor Air Quality

• 230 m³/h particle CADR
• 3-in-1 filtration
• 99.97% filtration of 0.3μm particles*
• PM2.5 monitoring
• Xiaomi Home app control
• Auto Mode
• 20dB Sleep Mode
• 27W rated power
• Compact 2.2kg design

👉 Order the Xiaomi Smart Air Purifier 4 Compact from AIYOZON today and enjoy smart, compact and efficient indoor air purification.