In this book, the authors present topical research in the study of the types, standard and problems of ventilation. Topics discussed include non-conventional energy systems in building design, industrial ventilation systems, pulmonary ventilators as monitoring instruments, influence of the ventilation rate on radon and thoron progeny concentrations in a room, acoustic filters in a power system, RANS and LES turbulence models for indoor airflows and wind towers as natural ventilation devices