340
Heating-Ventilating-Cooling: Design Criteria
344.7
ADAPTABILITY
1. Air-handling equipment must be capable of incremental modification to
accommodate future changes in performance requirements. It must be
convenient for total replacement or modification.
2. Distribution systems must provide reasonably oversized main
components to accommodate considerable variation in air volumes
over the life of the building. They must be capable of addition and
subtraction of branch components without requiring elaborate
rebalancing of the whole system. Rebalancing after future alterations,
as well as at initial installation, must be efficient, accurate and stable.
Flexible ductwork should be considered for branches serving terminals
which are specifically expected to be relocated. Future expansion of
the hospital should be possible with minimum interruption of
mechanical service to the existing building.
3. Terminals should be capable of modification or simple replacement to
provide changes of performance in special areas, or throughout large
areas, within the range of performance levels described in this section.
Individual terminals must be removable for repair or replacement
without disrupting or seriously unbalancing any other part of the
system.
4. The control system should be designed for convenient and rapid
modification to accommodate alterations in plan arrangement or in
performance requirements of the mechanical equipment, including
reassignment of terminals to thermostats and relocation of
thermostats.
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