Continuous or intermittent ventilation? A discussion of the best type of window ventilation. Dauerluftung oder stossluftung? Ein Beitrage Zur Frage nach der besten Art der Fensterluftung.

Examines by means of analytically calculable borderline cases the relative merits of continuous window ventilation or intermittent opening of windows. Illustrates the results relating to carbon dioxide content of the rooms ingraphs and discusses them. Findings depend strongly on the hygiene assumptions by which they are judged (identical maximum or identical mean CO2 concentrations or the identical mean air flow rate). In the first approximation finds that the 2 types of ventilation are of equal advantage as long as the windows are not left open for too long with intermittent ventilation which leads to excess energy consumption. For heating systems with a very rapid adjustment of the heat output to room temperature variations, intermittent window opening should be avoided.