Mechanical ventilation systems (MVSs) are essential for preserving indoor air quality and thermal comfort in structures. The insufficient awareness of the underlying principles of MVSs in traditional engineering procedures has resulted in inefficient design and operation of these systems. This has led to subpar indoor air quality, discomfort, and energy inefficiency in structures. This study examined the fundamental principles of MVSs and their implementation in engineering techniques. The methodology comprised a thorough examination of the available literature regarding MVSs and the fundamental principles that dictate their design and operation. This included technical reports, relevant dataset, and industry standards regarding ventilation system design and installation. The research included examination of structures equipped with mechanical ventilation systems to evaluate their effectiveness under real-world situations. The results of this study indicated that although traditional engineering procedures establish a robust basis for the design and installation of MVSs, numerous areas require enhancement. A significant result is that the design and installation of ventilation systems frequently neglect the individual requirements and usage patterns of building occupants. This may result in inadequate ventilation rates and inadequate indoor air quality. Furthermore, the maintenance and operation of ventilation systems are frequently neglected, resulting in diminished system efficiency and heightened energy usage. The research also indicated that the implementation of sophisticated technologies, including smart ventilation controls and energy recovery systems, can provide optimal solutions to enhance the performance of MVSs. The engineering community must prioritize established standards and training in mechanical ventilation systems to guarantee sustainable and healthy indoor environments.