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Dear Ali
The air handling for operation rooms are almost same as operation rooms but with some modifications or special parameters.
1. Since there is no return air used in operation rooms so there is no mixing box in that AHU.
2. There is100% Fresh air \\ outdoor air.
3. Most of the time there are heat recovery section which exchange heat from100% fresh air to the return air but they never mix. Its only a pre cool effect in that heat recovery section.
4. The filters used in that AHU are for clean room (HEPA Filters) which are very high efficiency in filtration process.
5. for some cases the humidifier water i also treated for chemicals to avoid rust for coils and accumulation of bacteria in air.
6. Rest the cooling system is same as normal AHU.
HOPE THIS WILL WORK.
100% fresh air that is the min requirement