Big + Quiet by name, big and quiet by nature. This Dyson air purifier creates a cleaner and more comfortable environment in rooms up to 100m². It's perfect for conference rooms to classrooms and everywhere in between. Its high-velocity, low pressure system runs whisper-quietly too, so it won't disturb the peace while it's working its magic. With 3 phases of purification, it sucks in 99.95% of nasty pollutants from all directions, so your room gets purified evenly. And the HEPA 13 filter makes sure whatever goes in, stays in, which means there's no chance of those pesky germs escaping.Good to know- It senses and reports CO2 levels in real time and shows them on the 1.44” LCD display- For extra peace of mind, the solid-state formaldehyde sensor destroys molecules 500 x smaller than 0.1 microns- An activated carbon filter traps microscopic particles and lasts for over 8000 hours- It may be advanced but it's super simple to use thanks to its single button operation