Thank you for your review. On high speed, the fan should rotate at a rate of about 160 RPM. The CFM rating has been tested and verified by independent 3rd parties according to FTC requirements. If you feel the fan is not operating properly, please call Hampton Bay customer service at 1-855-HD-HAMPTON (1-855-434-2678) and one of the team members will be able to get more information to help troubleshoot and resolve the issue.