720
Design Rationale: Structure
721.2.3
Access Floor
Pro:
1. All service distribution to one floor can be in the same service zone if air
is served up from below.
2. Service zone can be deep enough for horizontal access.
3. Depth of service zone is independent of depth of beams.
Con:
1. Floor jointing may be problem in hospital.
2. Air served from below implies extra duct cost, many large floor
penetrations.
3. Air served down to the floor below creates fire isolation problem.
4. Floor struts impede service distribution more than ceiling hangers,
although much less than truss members.
5. Structure must be level to serve as ceiling.
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