Additional information necessary for calculating the air conditioning system:
1 building plan of the room.
2 location of the room with respect to the sides of the world (north, northeast ...).
3 the size of the windows on each wall of the room.
4 what people are in the room (audience, restaurant, danchol ...)
5 Is the air conditioning system in line with the fresh air supply system?
6 Indicate how long people stay in the room.
P.S. According to your assignment for 1 person there is 6.75 m3/h of fresh air this is very small. People will feel a lack of oxygen.