To find the most manipulating factors in this paper, steps are to be followed to get the substantial results. A quality review has been performed in this paper so that researcher gets the clue about related parameters, boundary condition which was used in previous papers or by former researchers. By the time review will complete, outline is form about all the researches like about their outcomes, shortcomings of study and about future scope in every work. After this work will be start in the direction to give better solution. A car will be selected depends upon the majority of occupants. A CAD file will be generated and save in STP format. A Car cabin will generate by taking the dimension of car‘s cabin only. Vents will also be in position as it is placed originally. After obtaining the parameters on which formers have been worked. Then on the basis of that factors and levels are decided. Factors are those characteristics which really affects our observation. Levels are the different value for a single characteristic. Simulation will be accomplished by the help of ANSYS Fluent software. Simulation process is completed by providing the boundary condition in the form of different cases. Model equation will be generated for output parameters. Digital Anemometer or wind meter is a small in size easy to use device.