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3.1.6.6.(1)
OS3
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Emergency air supply for air-supported structures used as a place of assembly for more than 200 persons, when such structures are used as a building as described in Sentence 1.3.3.2.(1) of Division A.
Application 2: 
This also applies when air-supported structures are used as buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], as stated in Sentence 9.10.1.2.(1).
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Intent
Intent 1: 
To limit the probability that interruption of electrical power to the blowers will collapse the structure before the time required for evacuation in an emergency, which could lead to harm to persons.
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