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6.2.3.2.(3)
OS3OH1
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Construction and installation of ducts and fittings in air duct distribution systems serving heating, ventilating and air-conditioning systems, in buildings to which Part 6 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 6].
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Intent
Intent 1: 
To limit the probability that the performance of ducts or fittings will fall significantly below expectations, which could lead to, in the case of ventilation systems, depressurization in buildings, which could lead to the spillage of carbon monoxide gas from fuel-fired appliances, which could lead to the acute poisoning or asphyxiation of persons.
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