An HVAC system includes a desiccant wheel, wherein the wheel’s speed varies with airflow, the wheel is energized for at least a set period at startup, andor a heat recovery system upstream of the wheel enhances the system’s ability to dehumidify air. A first device receives data and an error status associated with the data. Various therapeutic and diagnostic uses arising out of the properties of the nucleic acid molecules and the antigens for which these code are also part of this invention.