Supply air temperature can be controlled from the desired room temperature or as an outdoor temperature compensation loop. The other halls, including scene 2, is ventilated with roof diffusers that have a power distribution pattern. The main stage has a maximum supply air volume of 49,000m 3/h and is ventilated with low airflows with pressure chambers under the floor and balconies. The airflow is controlled by the cooling needs and in addition with CO 2 sensors. The different halls have autonomous ventilation systems with variable air volumes. Total airflow is approimately 470,000m 3/h. There are 30 ventilation units in the Oslo Opera House, adapted to the use of the different areas. The users and equipment (such as musical instruments) are highly sensitive to poor indoor climate and require humidity control of the air. Further, it is used from early morning to late at night, which causes a long operation time for the units. The Opera House has a high maximum ventilation rate due to extreme variation in usage. The orchestra pit is highly flexible and can be adjusted by height and size using three separate lifts. The stage curtain was designed based on digital images of crumpled aluminium foil that reflects the colours of the auditorium. In the modern production of Swan Lake, dancers dance in water basins (created by lowering certain parts of a stage and using rubber mats to contain the water) filled with 5000 litres of warm water with pumps that remove the water after the play. The stage can be raised/lowered (using 16 lifts), bringing the most amazing ideas to life. The main stage itself (16 x 16m) is a turnable, with two side stages and a background stage. The main stage features advanced theater technology and a very advanced electro-acoustic system. In the oval reflector high at the ceiling, the magnificient chandelier is suspended illuminating the room with LED lighting, which looks like daylight, and while acting like an acoustic reflector - scattering and diffusing sound. The main stage is made of oak darkened by ammonia. The main stage has the shape of a horseshoe, which is one of the best shapes for opera and ballet, offering a short distance between audience and artists, good sight lines and an excellent acoustic atmosphere with long reverberation time to prevent high frequency vibrations and volume increase. The floor in the foyer is covered with white Italian marble and the walls are designed to look like a glacier structure with green light coloring at the bottom, such as the Icelandic glaciers shining through the pressed crystal structure at the bottom. The oak wood creates a complex organic geometry and works as an excellent acoustic attenuator. The “wave wall” in the foyer represents a threshold where the public meets art and is made of oak wood. However, a high amount of glazing does not interfere with a very comfortable climate indoors even on sunny days (some days it can be over 30☌ indoors). The glass façade gives a magnificent view of the interior wooden walls and creates a stunning image when illuminated at night. The outdoor roof is covered with Italian marble (looking like a carpet), which retains its brilliance and color even when wet, and has excellent properties in terms of stability, density and longevity. The roof is open to the general public and is a defining feature of the building as it rises from the fjord. Surprisingly, there is also a spacious green courtyard for relaxation and concentration. Workshops can be divided into hard workshops (for making scenery with carpenters, metalworkers, painters and decorators) and soft (for costume production, make up areas, administration and changing rooms). The base area of the Opera House is the same as the total area covered by four international standard football fields. There are three stages: a main stage with approximately 1400 seats, a scene 2 with a capacity of up to 440 seats, and a rehearsal and a stage 1 with 200 seats. The building is 38,500m² with over 1100 rooms divided into main sections: audience, rehearsal rooms, administration and workshops.

Oslo opera house