A variable air volume UFAD system increases ventilation effectiveness by providing occupants with the first benefit of outside air. The resulting ventilation can exceed the ASHRAE 62.1-2004 rate by 30% and helps LEED™ buildings achieve EQ credit 2 by delivering fresh air directly to occupants’ six-foot breathing zone.
As the fresh air enters the zone, it replaces existing contaminated air (rather than diluting or mixing it). Pollutants and stale air in the zone are carried to the ceiling by natural convection, where they are removed through return outlets.
This one directional airflow, coupled with the warmer cooling temperatures, enables not only more effective ventilation but also more fresh air being brought into the building during expanded economizer hours.