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The major goals of this project is to prove that the proposed Positive-Pressure Precision Ventilation (PPPV)system can alleviate heat stress and reduce ventilation-related energy consumption and GHG emissions while maintaining good air quality inside a commercial dairy building. Achieving this proof would involve these specific tasks: (1) a Computational Fluid Dynamics (CFD)-based system design, (2) field experiments to test the PPPV system, (3) an assessment of animal comfort and milk yield, (4) an assessment of air quality and health risks, and (5) an estimation of energy-use reduction and related GHG emissions. These tasks would address the program area priorities of this proposal (the A1521 Engineering for Agricultural Production and Processing) because they would (1) enable the engineering, computing, and modeling of systems intended for animal production; (2) develop advanced computational and engineering methods and technologies that could be used to manage production and the processing of data associated with agricultural systems; (3) develop and test risk assessment in order to reduce hazards to agricultural workers.