Modular badminton hall is proposed to Badminton Association Malaysia in 2017. This hall has several advantages including; easy to transport and relocate, and fast installation and dismantling. The air ventilation is one of the important aspects in designing the modular badminton hall. The low room temperature and the air velocity are important characteristics, and they must to take into account during design and calculation. Therefore, the present work employed CFD ANSYS Fluent to study the effect of exhaust fan numbers and exhaust fan arrangements on the room temperature and the air velocity. The heat source are contributed by humans, and the solar radiation effect are included in the computational. Five designs with various number of exhaust fans and arrangements are studied. According to the result, Design 5 produces the lowest average room temperature, 26.52°C. Although the average air velocity of Design 5 is the highest; around 0.083m/s, it still acceptable as it has the maximum air velocity spot lower than 0.1m/s. In the present work, Design 5 shows the best performances and the best air ventilation design for the Modular Badminton Hall in Malaysia.