There isn't a solitary conventional for building auto park ventilation devices, with important variances around the globe.  This could just be considered a result of cumulative community legislation, or it could also take note of distinct situations in unique international locations, including the likelihood of extreme climatic conditions.  For example, https://basement-ventilation69901.blogoscience.com/43017300/how-much-you-need-to-expect-you-ll-pay-for-a-good-basement-ventilation