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Positive pressure exhaust vent systems are designed to operate with a higher pressure inside the vent pipe than outside. When the Joukowsky Effect occurs, a near vacuum is created which results in the pressure inside of the vent pipe becoming lower than the pressure outside of the pipe. In extreme cases, the vacuum becomes strong enough that the structural integrity of the vent pipe may be compromised. This not only could result in costly damage to the exhaust vent system, but also could take the heating system offline until repairs can be made. 

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