Architect and Builder Magazine South Africa March/April 2015 | Page 46

The VAV air handling units generate
condensate which will be drained by gravity
to trapped floor drains in the plant rooms
to prevent odours being drawn back into the unit.
The wiring closet/nodal rooms and security
control rooms require 24 hours cooling with duty
and standby units. Each room has two VRF/VRV
units which are connected to the duty/standby
outdoor units located on the roof of the building
via refrigerant lines. The indoor under ceiling
units supply air directly into the room via unit
mounted grilles.
The ablutions, tea kitchens and network
rooms are separately mechanically extracted.
The exhausts are positioned as best as possible

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to prevent the re-entrainment of the exhaust air
through the fresh air intakes.
The kitchen is on the ground floor and has
dedicated kitchen canopies extract system
complete with built-in make-up air and fire
dampers on the extract spigot ducts. The extract
ducting (black steel welded) and make-up
air ducting is routed to the roof level via a
dedicated shaft.
The finishing kitchen on level 5 has a dedicated
extraction system complete with extract canopy
and black steel ducting.
The office areas and basements have smoke
extraction. The fireman’s lift lobby and relevant
staircases are pressurised. Basement parking is

Acacia House