The decision shall be based on the life cycle cost
analysis. The principal design features of each terminal system are:
A. SYSTEM FEATURES: The terminal systems shall be used for the perimeter
1. The outside air for ventilation shall be supplied by directly
ducted connections from a 100% outside air, central air handling
unit. The unit shall have the same quality of filtration as the
2. If the building has limited interior spaces, ventilation air, with
a suitable temperature control, can be used to cool these spaces
as well. If the building has an appreciable portion of interior
spaces, the system design shall include an all air system
generally described in paragraph 3.2 above.
3. A ducted general exhaust air system shall be provided to pick up
exhaust air from toilets, janitor closets, and soiled storage
rooms. The exhaust air system shall also pick room air from all
occupied areas. See Section 6, ENERGY CONSERVATION, for heat
recovery system criteria.
B. SYSTEM CONFIGURATIONS:
1. Four Pipe Fan coil Units: The fan coil units shall be located
under the windows in vertical, floor mounted arrangement.
a. The use of the horizontal, ceiling suspended, fan coil units is
not permitted due to the probable clogging of the cooling coil
condensate drain lines and drain pans and the resulting
possibility of the growth of algae and bacteria in drain pans.
b. The fan coil units shall not be used for the interior spaces
2. Four Pipe Radiant Ceiling Panel Systems: The radiant ceiling
panels shall be used to heat and cool the perimeter spaces.
panels shall be selected in modular (2 feet x 4 feet and/or 2 feet
x 2 feet) and continuous, wall to wall, linear configuration(s).
With linear design, the width of the panels shall be adjusted to
match the cooling and heating loads.
a. If the modular panels occupy at least 50% of ceiling area,
complete ceiling construction shall be composed of matching
metal ceiling panels made by the same manufacturer. The ceiling
installation shall be done by one contractor to avoid
coordination problems between active cooling/heating panels and