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Design Rationale: Services
2. Special Exhaust and Toilet Exhaust: Main Distribution
considered adaptable components, although they would probably
rarely be altered unless a floor is converted to research use. In that
case, an acid-resistant duct network is added to exhaust fume hoods.
In order to make the main special exhaust ducts permanent, one of two
conditions would have to be met:
a. Install acid-resistant exhaust trunks of sufficient size throughout, in
anticipation of the conversion of any floor to research use.
b. Restrict research to a specified set of floors. Install the less
expensive non-acid-resistant trunks on all other floors as permanent
components.
3. Branch Ducts
Branch ducts are considered adaptable so they may be sized and
positioned precisely to suit the demands of the opening configuration.
In alterations, many zone ducts and terminals will in fact be reusable.
Any removal or installation of new ductwork can be handled quite
easily, as ample work-space is provided within the service zone.
4. Fans and Air-Handling Units
a. Fans sized for ultimate capacity in the opening configuration would
increase first cost considerably. Also, a fan unit sized for a research
laboratory would run quite inefficiently if it only had to serve a
nursing unit (at perhaps one-half the air volume). For this reason,
provision must be made to replace supply air-handling units and/or
exhaust fans when air volume requirements change radically.
b. Supply air-handling units and exhaust fans must be positioned to
allow replacement in any case, as their predicted lifespan is far less
than that of the structure itself.
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