AlfaTech HVAC System Strategies for Airborne Diseases

H V A C S Y S T E M S T R A T E G I E S F o r A i r b o r n e D i s e a s e s

CONTROL OF AIR DIRECTION - OVERHEAD DISTRIBUTION

The majority of buildings in USA are served by “Forced Air” systems.

These systems can have either overhead or underfloor distribution

systems.

With overhead distribution, the conditioned air enters the space from

supply ducts/diffusers installed over the occupied zone. The return air

exits via return air plenums or diffusers positioned in the ceiling or full

height walls.

Overhead air distribution is designed to mix the entire air volume in an

enclosed space and the air will circulate for longer and then reach

occupants.

Any suspended pollutants or particles will linger for greater periods of

time, resulting in lower air quality.