Curves & Bulkheads

Bulkhead; a boxlike structure built over an opening
Curves; a line that deviates from straightness in a smooth, continuous fashion

Bulkheads & Curves are generally created using an MF system, the grid is fully concealed and the ceiling lining is joint-treated or plastered to present a seamless, appearance.  These are often used to conceal services or structural parts of a building at high level.  Also used to create focal points within a ceiling often used with lighting effects.  Suspension from concrete or timber floors
Durable ceiling lining.  Ventilation ducts and other services accommodated in plenum.  Access panels provide service access