Duct cleaning tips is a common procedure that can help reduce allergies and asthma symptoms. It’s not a cure-all, however, because contaminated air can come from other sources. Nevertheless, dirty ducts do spread around the same pollutants that make your allergy and asthma symptoms worse: dust, pet dander, mold, etc.

Fortunately, it’s possible for homeowners to do some duct cleaning themselves. Before a professional arrives, it’s a good idea to do some preparation to protect your carpet and other furnishings from accidental damage during the cleaning process.

Duct Cleaning Tips: Why and How to Keep Your Ducts Clean

Begin by locating the supply vents. The ducts in a room transport conditioned air from the HVAC system to the room, while the return ducts take air back to the HVAC system. Identify which ones are which by placing a tissue on the vent. If the tissue sticks, it’s a return duct; if not, it’s a supply duct.

Remove any clutter from the area where the ducts are located. This will make it easier for the duct cleaner to access all the vents. Also, be sure to change the air filter in your home. This is an important step that should be done at least monthly, according to the air filter manufacturer’s recommendation.

Moisture should never be present in ducts because it can promote biological growth (mold, mildew) and distribute it throughout the home. Moisture is usually caused by condensation, but it can also be the result of leaks, spills and improper maintenance of humidifiers. Moisture can be minimized by promptly correcting any water leaks and ensuring that drain pans slope toward the drain.