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If these components of a buildings HVAC system are not properly installed, maintained and operated they may become contaminated with excess dust particles, pollen and other debris. When excess moisture is present the potential for microbiological growth (e.g. mold) is increased and spores from such growth may be released into the occupied space. Some of these contaminants may cause allergic reactions or other symptoms in exposed persons.
When dirt, dust and debris collect on the hidden or inside components of a building’s HVAC system, air pressure relationships of the building design change and alter the air flow characteristics of the occupied space. Air that is supposed to have a positive pressure relative to the space becomes negative creating a pathway for microorganisms, moisture and other building contaminants. Cleaning the HVAC system and removing the accumulated dirt and debris returns the HVAC system to its designed specifications and allows the building to function properly.
The restriction of the movement of air across a cooling coil or heating coil, because of excessive dirt and debris build up, results in a significant energy cost to the building. The same can be said about efficiency loss of a fan or blower that has dirt collected on fan blades. Dirt accumulation prevents the fan blade from efficiently moving air. Inside an air conveyance system there are many unseen impingement points where dirt and debris can accumulate. These impingement points are turning vanes, dampers, splitters, reheat coils, Variable Air Volume units and other devices installed to move and direct air flow. Any obstruction to air flow through a forced air system will result in a loss of efficiency resulting in higher energy costs.