The book "Methodological recommendations for the study of the economic efficiency of ventilation using tracers", written by the authors Vishnevsky and Utkin, is a unique work that combines the theoretical foundations and practical aspects of the study of ventilation systems. This work will be of particular interest to specialists in the field of engineering, architecture, as well as students and graduate students studying the issues of energy saving and optimization of ventilation systems. The book discusses in detail methods for assessing the cost-effectiveness of ventilation, focusing on the use of tracers - special substances that allow you to track the movement of air and assess its quality. The authors share their knowledge and experience, providing readers not only theoretical calculations, but also practical recommendations for research. This makes the book an indispensable tool for engineers and designers seeking to optimize ventilation systems in different types of buildings. The topics raised in the book cover a wide range of issues related to the design and operation of ventilation systems. Vishnevsky and Utkin discuss the importance of a proper assessment of economic efficiency, which is especially important in the modern world, where energy saving and environmental issues come to the fore. The book addresses aspects such as the impact of ventilation quality on human health, as well as the economic consequences of improper design of systems. Readers will be able to learn how tracers can help identify ventilation problems and how their use can lead to significant resource savings. This work will be of interest not only to professional engineers, but also to anyone who wants to understand more deeply how the ventilation system works and how to improve its efficiency. Students of technical specialties will find in the book useful tips and examples that will help them in their studies and future careers. The book may also attract the attention of environmental and sustainability researchers, as it raises important questions about the impact of ventilation on the environment. The style of the authors is distinguished by clarity and accessibility, which makes complex technical aspects understandable even for an unprepared reader. Vishnevsky and Utkin use many illustrations and diagrams, which helps to visualize the concepts presented and facilitates the assimilation of material. This makes the book not only informative, but also fascinating to read. If you are looking for literature on the topic of ventilation, energy conservation or environmental safety, “Methodological recommendations for investigating the cost-effectiveness of ventilation using tracers” will be an excellent choice. It will not only expand your knowledge, but also inspire new ideas and solutions in your professional activities. This book is the key to understanding the complex processes taking place in ventilation systems and will help you become a more competent specialist in your field.