Air duct cleaning improves the energy efficiency of a ventilation system, removes allergens from the circulated air and discourages mold growth. Regular cleaning ensures that the indoor air quality remains high.
There are several approaches to air duct cleaning, and negative pressure cleaning is one of the most effective. During this process the ducts are sealed, and a powerful vacuum hose is attached to one of the vents. With the vacuum on, the duct walls are scraped with mechanical brushes or sprayed with compressed air. The loosened dust and dirt are immediately sucked into the vacuum.
Negative pressure cleaning is a professional service. Other cleaning techniques, however, do not require outside assistance. For example, household vacuums with long hose attachments remove loose dust, and wiping the duct walls with a damp rag removes surface dirt.
Thorough air duct cleaning includes the peripherals and hardware surrounding the ducts. It is particularly important to clean the vent grills. This process involves unscrewing the grills, washing them with soap and water, and replacing them once they are dry.
Filter replacement is another important aspect of duct cleaning. Disposable filters become ineffective once they are clogged with dirt, and must be replaced several times per year. Non-disposable filters should be cleaned at intervals recommended by the manufacturer.