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Why Clear Vents Are Your First Line of Defense Against Carbon Monoxide Many modern homes use high-efficiency furnaces and water heaters that vent exhaust gases out the side wall rather than through the chimney. These vents serve a dual purpose: they pull in fresh air for combustion and discharge harmful exhaust, including the odorless, deadly gas carbon monoxide. If snow or ice blocks these vents, exhaust can back up into your home, creating a life-threatening situation. Whil