The AP301 is good for a standard sized living/dining/bedroom or a small flat with kitchen/diner. 🍃𝐅𝐄𝐄𝐋 𝐓𝐇𝐄 𝐀𝐈𝐑 𝐂𝐇𝐀𝐍𝐆𝐄: Our hepa air purifier with built-in PM2.5 sensor, a color-coded light from blue/very good to green/good to yellow/moderate to red/polluted and by automatically adjusting the auto mode's fan speed in response to changes in the current air quality.