Chan M.Y., Chow W.K.
Bibliographic info:
Building and Environment , Vol. 39, Issue 6, June 2004, pp 635-643

Investigations in six car parks were carried out. Measurements of carbon monoxide levels were made during the peak hours to compare the performance of the different types of ventilation systems : the performance is better with a combined supply and exhaust system than the exhaust only system though more energy is consumed.