Most homes, classrooms, and offices in India use split ACs that only recirculate the air in the room. We primarily see 2 air quality problems across India – elevated levels of PM2.5(black carbon nanoparticles) and Carbon Dioxide. For these indoor spaces, we recommend a combination of air purifier and the Ventimax. The air purifier will reduce the PM2.5 effectively and the Ventimax will work silently in the background like a window of filtered fresh air, to bring Oxygenated air and create a slight positive pressure on the room, so that only filtered air leaves the room.