Moisture at 60 percent or above is required for growth, but less moisture does not kill mold, it just goes dormant. When your air conditioner is running, moisture condenses on the evaporator coils, causing a growth cycle. According to WebMD, mold is the biggest threat to your health in your home.
The supply vent pictured is an extreme example, and usually takes eleven or twelve years to get this contaminated. Your health is usually affected before any evidence shows itself on your vents, so take action early. Annual air duct sanitizing will stop and prevent this from happening in the future.
Your allergy symptoms will be at their worst in the morning because at night, you are sleeping with the lights off. (Remember, mold and bacteria thrive in darkness.) During the daylight, most of the live contaminants are killed by light before you breathe them.
We fog the entire system using a ULV (Ultra Low Volume) fogger, through a system intake, to kill every bacteria, virus and mold spore that the product has ever been tested on. This thyme oil product will continue to kill any contaminant that enters the system for up to two years. We do not introduce brushes into the supply ductwork as that can cause damage to flexible ducts and it would also release mycotoxins from the mold.
We clean all vents, both supply and intake vents, with a HEPA filtered commercial vacuum cleaner that does not in any way make a mess in your home. The entire process is usually completed in less than an hour and turns your entire duct system into an air purification system instead of a breeding ground for mold and bacteria. We do not remove any supply vent grills. There is no need to vacuum the inside of the duct itself in a working system. If there were any loose dust and debris in a supply duct, it would blow out whenever the system was in operation.