Hi,
The plant where I work vacuum forms ABS, PS, and HDPE. We have pretty good ventilation except during winter as the large exhaust fans and shipping doors are closed. Most of the time, it is not too bad, but there are times it can get smelly in the shop.
I'm just curious as to what precautions other facilities do/use. Do you monitor with meters? Install vent hoods?

Thanks,
Brian