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Hello Mills, Thank you so much for reaching out. Excellent question. CFM (cubic feet per minute) is a unit of measurement of the exchange of air from one area to another. The higher the CFM, the more air can be moved from one area to another. If you vent internally, then there is no need to use CFM since air is being recirculated. This model has a top CFM of 400 and has four different speeds. We hope this was helpful. Best wishes. Mike@GEA
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