Health Hazards with Duct Systems
Leakage in the duct system can present health hazard risks. Low pressure in the basement can draw in flue gases from the furnace and radon gas from the soil. Flue gases containing carbon monoxide are dangerous and exposure to radon gas is the second leading cause of lung cancer, after smoking. Return air leaks can also contribute to health problems. Air drawn from attics, crawl spaces, and basements can be laden with toxic chemicals, mold, excess humidity, dust, and other contaminants. Experts disagree about how common these hazards are, but upgrading your duct system reduces your risks.