Bosch Air 4000i Smart Air Purifier (White)

How often do I need to replace the filters?

The 3-in-1 filter system typically requires replacement every 6-12 months depending on usage and air quality conditions. The pre-filter can be cleaned regularly to extend overall filter life. The app and LED display will indicate when filter replacement is needed. Heavy usage in polluted environments may require more frequent changes, whilst light usage in clean areas can extend filter life beyond 12 months.

Can I use this air purifier in my bedroom without disturbing sleep?

Yes, the quiet mode operates at less than 25 dB(A) which is virtually silent and comparable to a whisper. All lights switch off automatically in this mode to prevent sleep disruption. The unit continues effective air purification throughout the night whilst maintaining this ultra-quiet operation, making it ideal for bedrooms, nurseries and other sleep areas.

What types of pollutants does this air purifier remove?

The 3-in-1 filter system removes over 99% of common indoor pollutants including pollen, dust mites, pet dander, viruses, bacteria and smoke particles. The HEPA filter captures particles as small as 0.3 micrometers whilst the activated carbon layer eliminates odours, cooking smells and volatile organic compounds. This makes it effective for allergy sufferers and general air quality improvement.

How do I set up the smartphone app and smart home integration?

Download the Bosch Smart Home app and follow the setup wizard to connect via Wi-Fi. The device supports both 2.4GHz and 5GHz networks without requiring router changes. For smart home integration, the unit supports Matter protocol for Apple HomeKit, Google Assistant and Amazon Alexa. Voice control setup is completed through your preferred smart home ecosystem app.

What room size is this air purifier suitable for?

The Air 4000i effectively covers rooms up to 62.5m² with its 300 m³/h clean air delivery rate. For optimal performance, use in rooms slightly smaller than maximum capacity. Larger open-plan areas may require longer cleaning cycles, whilst smaller rooms will achieve faster air turnover. The auto mode adjusts performance based on detected room size and air quality conditions.

How much electricity does this air purifier consume?

The unit operates with low power consumption, though exact wattage varies by fan speed setting. Quiet mode uses minimal electricity whilst higher speeds consume more power. The auto mode optimises energy usage by adjusting fan speed only when needed. Running costs are typically low compared to other household appliances, making continuous operation economical for maintaining air quality.

Does the air purifier work automatically or do I need to control it manually?

The auto mode provides completely automatic operation by continuously monitoring air quality and adjusting fan speed accordingly. The PM2.5 sensor detects pollution levels and increases cleaning power when needed, then reduces to quiet operation when air is clean. You can also manually control fan speeds, set timers through the app, or use voice commands for specific requirements.

What maintenance is required beyond filter replacement?

Regular maintenance involves cleaning the pre-filter monthly and wiping the exterior with a damp cloth. The air quality sensor may need occasional cleaning with a soft brush to maintain accuracy. No other routine maintenance is required as the unit is designed for reliable long-term operation. The LED display and app will indicate any maintenance requirements or system alerts.