The book is a guide to modern ventilation equipment. It systematizes extensive material and formulates topical issues of effective use of ventilation equipment, provides general information about fans, basic information on aerodynamics and thermodynamics. Peculiarities of fans operation in networks, air intake plants, water heating units, acoustic characteristics of fans are considered. The issues of operation of air-heat curtains, issues of balancing and adjustment of ventilation systems are covered. The appendices contain reference material. The book is written in simple technical language. This makes it available to a wide range of specialists: designers, operators, fixers, specialists in the selection of ventilation equipment, as well as teachers and students of engineering and construction specialties.