def METHOD_NAME(self):
    """
    Retrieves the speed of fan in revolutions per minute (RPM)
    Returns:
        An integer, speed of the fan in RPM
    """
    attr_rv = self.__get_attr_value(self.fan_rpm_attr)
    if (attr_rv != 'ERR'):
        return int(float(attr_rv))
    else:
        return False