Discussion on ventilation calculation for enclosed garages

Analyses the improvement of hygienic standards and the ventilation rates of the enclosed garages in China, and finds that the allowable concentration of carbon monoxide in the enclosed garages has been reduced from 100200 mg/m3 to 30 mg/m3, however, the exhaust air change rate provided by relative design codes and technical measures remains basically unchanged. Aiming at the problems including the results of ventilation rate calculation methods given in the literatures varying widely from one to another, the maximum value of the calculated air volume reaching even about eleven times of the minimum value, and the quotes and quotes from the secondary sources also bringing many errors, gives the correct calculation methods. Considers that the differences of the calculated air volume mainly embody in the carbon monoxide emissions of each car, regardless of the writing errors. The values widely used neither reflect the progress of the vehicle pollutant emission control technology, nor adapt to the current situation, which lead to the larger exhaust air volume.