Black Spots On Flexible Ducts Attic Mold

Black dust around air vents.

Black spots on flexible ducts attic mold.

As cool air flows through the vents on hot days the moisture in the air can condense inside the air vent. You do not have to do that every day. Common causes of black mold in air vents mold in air ducts most commonly occurs when there is moisture inside the ductwork. The black dust may be patchy and difficult to wipe off.

Keep in mind that mold spreads through spores which are tiny particles that are invisible to the naked eye. Black mold can also grow behind the walls or attic ceilings completely undetected until the occupants smell the presence or experience health problems. Black mold has a distinctive unpleasant musty smell. This is also why regular maintenance on the air conditioner is very important.

Combine 1 cup of bleach with 1 gallon of water. Mold species such as stachybotrys chartarum which looks like slimy growth loves attic basement bathroom and space under the sink. You can see the same principle at work when you drink an icy beverage and water beads up on the outside of the glass. You may have black mold in your air ducts if you notice any of the following signs.

Look for the first signs of mold around ac vents in the ducts and in the drip pans. Allow the inside of the vent to dry. If you notice black dust around your air vents this could be a sign of black mold growing within. Wipe the blades duct opening and the inside of the vent with a long flexible mop soaked in the bleach solution.