When air leaves a supply vent it is coming out at a high velocity due to being squeezed through the louvers of the vent.
Why does carpet get dirty around air vents.
Air filters remove most of these from the air stream but not for all parts of the hvac system.
Any pollutants in the air are trapped by the carpet and turn the carpet gray or black in that area.
There a few sources that can be responsible for dirt streaking around ac vents but the most common source is actually the room where the streaking is occurring.
However when black mold starts growing in your air vents things get a little trickier.
One of the main contributors to dirt streaking is the turbulence of the conditioned air coming out of a supply vent.
Top 5 dirty air duct indicators.
So why else does carpet get so dirty.
When black mold grows on walls floors carpets and so on it s relatively easy to spot.
Every time you walk inside your shoes track in soil.
If you re waking up with a scratchy throat itchy eyes or can t stop sneezing poor air quality could be part of the problem.
The proof is in the carpet.
Mold can be one of the negative effects of floods or can indicate a problem with your air conditioning system.
The air that enters the room from the supply vent comes in at such a high velocity that it creates turbulence in the air.
Common pollutants that can contribute to the problem include smoke from cigarettes and candles cooking oils fireplace ash and dust.
The dirt from shoes and pet paws and particles in the air that settle into carpet fibers can be a major contributor to dust in the home.
As the air is forced through these gaps it passes through the carpet which acts as a filter to the air.
When contaminants flow through your ventilation system the dirty air blows into the various rooms of your home.
Oil from the driveway fertilizer from the lawn pollen in the grass and everything you step upon gets tracked in on your carpet.
While clean and efficient air vents won t recirculate this through your home air conditioning or heating units burdened with excess dust could be recirculating pollen and other debris.
Frequent vacuuming daily or every other day can help as.
You can find evidence of filtration soiling anywhere airflow is restricted near carpeting.