The Philips AC4221/61 is the brand’s largest-coverage smart air purifier in our range, built for living rooms and larger spaces that need real airflow without giving up the app control and sensor precision Philips is known for. Here’s the full spec breakdown and who it’s built for.

Philips AC4221/61 — Key Specifications

• Coverage area: up to 72 m² (approx. 775 sq ft)
• CADR: 600 m³/h
• Filtration: 4-layer — Pre-Filter, NanoProtect HEPA, Activated Carbon Filter (99.97% capture at 0.003 microns)
• Sensors: PM2.5, gas, temperature, humidity — with real-time AQI display
• Noise level: 15 dB (sleep mode) to 51.5 dB (max)
• Smart features: Philips Air+ app, WiFi, Google Assistant/Alexa voice control
• Power consumption: 54W at maximum speed
• Filter life: up to 9 months
• Warranty: 2 years
• Price: ₹26,500

Who the Philips AC4221/61 Is Built For

At 600 m³/h CADR and 72 m² rated coverage, the AC4221/61 is Philips’ answer to larger, open-plan spaces — living rooms, combined living/dining areas, or bigger bedrooms. What sets it apart from Honeywell’s large-coverage models isn’t raw airflow (the Honeywell U1 and U2 both edge ahead there), it’s the sensor suite: full PM2.5, gas, temperature, and humidity monitoring feeding a real-time AQI display, plus a genuinely silent 15 dB sleep mode that’s rare at this coverage level. For buyers who value data over raw numbers, this level of environmental monitoring is difficult to find elsewhere in this price range.

4-Layer NanoProtect HEPA Filtration Explained

The AC4221/61 steps up from the AC0950’s 3-layer system with an added filtration stage:

1. Pre-Filter — captures larger particles like dust and pet hair
2. NanoProtect HEPA — captures 99.97% of particles as small as 0.003 microns
3. Activated Carbon Filter — removes odours, smoke, and VOC gases
4. Real-time sensor feedback loop — the gas and PM2.5 sensors continuously adjust fan speed automatically, so the unit isn’t running at full power when air quality is already good

Philips AC4221/61 vs Honeywell’s Large-Coverage Models

If raw coverage and CADR are your priority, the Honeywell Air Touch U1 (700 m³/h, 1,085 sq ft, ₹23,999) and U2 (650 m³/h, 1,008 sq ft, ₹27,999) both outperform the AC4221/61 on paper. Where the Philips pulls ahead is sensor precision and near-silent operation — if you want a unit you can leave running overnight in a shared living space without noticing it, the AC4221/61’s 15 dB sleep mode is the standout feature Honeywell doesn’t match at this coverage tier.

Common Uses for the Philips AC4221/61

This purifier suits home living rooms, combined living/dining areas, larger bedrooms, and small home offices where multiple people share the space throughout the day. The temperature and humidity sensors add practical value beyond pure air quality — households can monitor whether a room is running too dry during winter heating months, which is a common secondary concern alongside PM2.5 levels during Delhi NCR’s smog season. The auto mode setting also means you don’t need to manually adjust fan speed as conditions change through the day.

Frequently Asked Questions

Q: Is the Philips AC4221/61 quiet enough for a bedroom?
A: Yes — at 15 dB in sleep mode, it’s one of the quietest large-coverage purifiers we stock, genuinely unnoticeable overnight.

Q: Does it automatically adjust based on air quality?
A: Yes — the built-in PM2.5 and gas sensors feed a real-time AQI display and can automatically adjust fan speed through the auto mode setting.

Q: How does it compare to the older Philips 2221?
A: The AC4221/61 offers higher CADR (600 vs the 2221’s lower rating) and a more complete sensor suite, positioning it as the more advanced of the two current Philips models we stock.

Want to check if the Philips AC4221/61 fits your space? WhatsApp our team your room dimensions and we’ll confirm the right fit before you buy.

Buy the Philips AC4221/61 Air Purifier — ₹26,500