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That should cover 800 square feet, but if you are having performance issues, and it's not handling well register the device and call Dyson customer service for assistance. They can be emailed as well. If it's too late to return it. Until then increase the fan speeds to improve the air change per hour rate. good luck
Sorry, there was a problem. Please try again later.Hello Jamie, This is Miella from Dyson. While the DP04 Pure Cool purifier can work in any sized room, the time it takes to purify the space depends on environmental factors such as ventilation, room layout, etc. Hope this helps! Miella Dyson Customer Support
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