The presented diploma thesis discusses the topic of the designing a central ventilation system for adminstrative building located in town district Bratislava –Petržalka. It targets specific technical solutions for the entire building. It analyzes the usability of individual heating and cooling systems. The objective for this project is to design a ventilation system suitable for the given object. The thesis consists of a theoretical, practical and drawing part. The first part of this project briefly elaborates individual solution possibilities for the given project and the design process. The second and third part of this project is dedicated to detailed technical design of the building. The final product is the specific project for administrative building.