“What is the CFM number?”

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• CFM is Cubic Feet per Minute. It is a rate of flow for air. The 434 Liters Per Second mentioned by the others is wrong. They meant 434 Liters Per Minute. A fan that produces 434 LPS is equivalent to 26,040 LPM. (60 x 434 = 26,040). In CFM terms, that would be about 920 Cubic Feet per Minute. That would be enough to cool the average U.S. home with a lot left over.

  Answered by TomTopeka 4 years ago

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• This fan has speed settings 1-10. According to Dyson it has a CFM of 434 liters per second at 10. I will mention that ‘night mode’ sets it to speed 4 and that’s the best noise/CFM speed you can get before it gets very audible in a quiet room.

  Answered by WishReviews 6 years ago

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• Hello Gina, this is Kelly with Dyson. The Dyson TP01 Pure Cool Tower air purifier fan, in max power, has a CFM of 434 liters per second. Best wishes, Kelly Dyson Customer Support

  Answered by DysonProductExpert 6 years ago

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