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Then plug it in, turn it on and... breathe. Don't hear anything? Check the blue "power on” light. Blueair is so quiet, you may not realize it's on. But as the pat- ented Blueair system removes dust, pollen, smoke, gases and odors from your indoor environment, we think you'll notice the difference, G E N E R A L S A F E T Y I N S T R U C T I O N S The Blueair300/Blueair400 is an electrical appliance. Before using it for the first time, please read these safety instructions and take precaution