приточная система вентиляции(...was compared with a standard positive pressure (plenum) ventilation system with air supply through an inclined perforated screen along one wall at the ceiling and evacuation at floor level (conventional turbulent or mixing system, 16 air changes/h) ...Alexander Demidov)
кратность воздухообмена(встречается в таком значении; только для перевода на русский: For a house with a typical North American 8-ft (2.44-m) ceiling height, the recommended minimum ventilation rate is then 0.28 air changes per hour (h-1).escholarship.org)
расход наружного воздуха(в литрах в секунду либо кубометрах в час: The ventilation rate of a building, Q, is usually defined as the rate at which external air (fresh air) flows into the buildingmonosyllabique)
