... : schools, hospitals, laboratories, a sports centre, cinemas, hotels, etc. ventilation. 4. Conditions apply: dust of less than 150 mg / cu m ... -2-B51.13.151400206-68.616.8-31.564-67Y801-4-B50.5541400330.5-113.834.18-64.173-75Y801 ... -4-B50.5551400517.8-176.566.67-12579-81Y90L-4-B51.56.3960382.5-181.491 ...