HOW AIR FILTRATION FOR IMPROVED AIR QUALITY FITS INTO YOUR BUDGET.

THE RELATIONSHIP BETWEEN INDOOR AIR QUALITY, AIR-CONDITION & MECHANICAL VENTILATION SYSTEMS
Straits Times Article On Contaminants Commonly Found In Air Ducts

A building's HVAC / ACMV system provides conditioned air to occupied spaces within the building; However, the same ACMV system that distributes conditioned air throughout a building can also distribute dirt, dust and biological contaminants and contaminate the supply air.
Typically, fresh air is drawn in from the outdoors along with the recycled air from the occupied space into an air handling unit (AHU) where it is conditioned. Before the air enters the unit, It usually passes through a filter design to protect the AHU from becoming contaminated by large particles of dust and debris.

However, many low efficiency filters commonly used today will not prevent the smaller particles of dust and debris from entering the air handling and distribution system. Over time, these deposits may from sizable accumulations in the air ducts.

In the course of normal building operations, the humidity level within the HVAC / ACMV system can vary greatly. High humidity can combine with dust and debris in the system to support the growth of mold/fungi which may cause adverse health reactions among building occupants.