The CoVentilation Method™ is a revolution in indoor air supply, distribution, and exhaust.  Well-designed air inlet and exhaust manifolds would be placed throughout the occupied space to supply and purge it as uniformly and rapidly as practicable. Air admitted into the occupied zone[1] would move upwards along with suspended particles and vapors to be collected in the upper level exhaust manifold.  This method would significantly reduce dispersion of human exhaled aerosols and desiccated particles that remain suspended in the room with conventional HVAC.[2]

Conventional HVAC systems often supply room air from the ceiling, which moves suspended particles back into the breathing zone. Some spaces with top-down air supply exhaust through the entry door, or the gap under the door when closed. Classrooms and medical exam rooms are typical examples.

[1] Occupied zone – Places where people are sitting and standing for most spaces.

[2] Success criteria is based on residence time distribution for particles in the virus to aerosol size range.


'I never enter a commercial space without locating the air supply to the room. So far, all the mechanically ventilated spaces I have been in supply air in a top-down manner with recirculation zones throughout.  This method ensures that most of the constituents that make indoor air quality poor are well distributed within the space.'  John Drennen


If you find a public space with top down air supply and random air movement, refer them to this site for an introduction to the future of HVAC (Heating Ventilating and Air Conditioning). Start at...

Ventilation Basics - What's Your IQ?