Philips AC3420/10 3400 Series (2-in-1 Air Purifier and Humidifier)

How often do I need to change the filters?

The filters last up to one year with normal use. The device has smart filter indicators that calculate filter life based on usage and air quality, alerting you via the mobile app when replacement is needed. This helps maintain optimal performance and ensures you're not changing filters too early or too late.

Can this device work without the mobile app?

Yes, the device has touch controls on top for basic operation including power, fan speed and mode selection. However, the mobile app unlocks advanced features like real-time air quality monitoring, detailed humidity information, timer settings, filter life tracking and remote control. The app significantly enhances the user experience and functionality.

How loud is this air purifier during normal operation?

The device operates quietly with sleep mode at just 16.5dB, quieter than a whisper. Normal operation produces minimal noise that won't interfere with TV watching or conversation. The fan speed automatically adjusts based on air quality, so it only increases noise when higher purification is needed, then returns to quiet operation.

What size rooms can this air purifier handle effectively?

This model covers rooms up to 78m² with its 300m³/h CADR rating. It can purify a 20m² room in less than 10 minutes. For optimal performance, it works best in medium to large living rooms, bedrooms or open-plan spaces. Smaller rooms will see faster purification times and more frequent air changes.

How much water does the humidifier hold and how often needs refilling?

The water tank holds 3.2 litres and provides humidification up to 650ml/h at maximum output. Depending on your humidity settings and room conditions, you'll typically need to refill every 5-12 hours of continuous humidification. The device monitors water levels and alerts you via the app when refilling is needed.

Does this remove pet odours and allergens effectively?

Yes, the 3-layer HEPA filtration removes 99.99% of pet allergens including dander and the activated carbon layer tackles odours. It captures particles down to 0.003 microns, which includes most pet-related allergens. The continuous air circulation helps eliminate lingering pet odours throughout the room, making it excellent for pet owners with allergies.

Is this suitable for people with asthma or severe allergies?

Absolutely. The device removes 99.97% of particles including pollen, dust mites and pet allergens - common asthma and allergy triggers. It also removes 99.9% of airborne viruses and bacteria. The humidification function helps prevent dry airways that can trigger asthma symptoms. Many users with respiratory conditions report significant improvement in air quality and symptom reduction.

How much does it cost to run continuously?

With maximum power consumption of just 43W, running continuously costs approximately £3-4 per month based on average UK electricity prices. The smart sensors mean it doesn't always run at maximum power, automatically adjusting based on air quality to optimise energy usage. This makes it very economical for 24/7 operation compared to many other air purifiers.