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Ventilation Systems are an essential component of sustainable building design, playing a crucial role in maintaining indoor air quality and energy efficiency. These systems facilitate the exchange of stale indoor air with fresh outdoor air, thereby diluting or eliminating pollutants, odors, and carbon dioxide generated by occupants and building materials. In Architecture, Ventilation Systems are carefully integrated into building designs to optimize natural ventilation, minimize energy consumption, and enhance thermal comfort. They can be passive, such as operable windows and vents, or mechanical, using fans and ducts to distribute air. Green Building practices prioritize the use of energy-efficient Ventilation Systems that contribute to improved indoor environmental quality, occupant health, and overall sustainability. These systems often incorporate advanced technologies like heat recovery ventilators (HRVs) and energy recovery ventilators (ERVs) that precondition incoming air using waste heat or coolth from exhaust air. LEED Certification recognizes the importance of well-designed Ventilation Systems in promoting sustainable building practices. Projects pursuing LEED certification are evaluated on various aspects related to Ventilation Systems, such as air quality monitoring, demand control ventilation, and filtration efficiency. By incorporating these strategies, buildings can achieve higher levels of indoor environmental quality while reducing energy consumption and costs.