> >In general labs have 6-12 air changes per hour. At that exhaust rate you need a lot of people and equipment to really affect the ambient room temperature. In 46 years I have only seen a few labs with so much heat producing equipment that it seriously affected the HVAC loads versus the enormous amount due to the hood exhaust.
Mostly outside of chemistry labs, I have seen many labs whose ventilation systems are not hood-driven and so are in 6 ach range. In some cases, these rooms are used as ‰??freezer farms‰??, where all the walls are covered with freezers and refrigerators working very hard to maintain the temperature settings requested of them. In addition to having high temperatures, these rooms tend to be quite noisy and unpleasant. And those conditions can impact the use of neighboring rooms.
As you noted, this problem is often anticipated by facilities staff as they see the cooling devices stack up, but the allocation and management of sample storage space is not often driven by facility considerations in the academic setting. This situation doesn‰??t seem likely to be the case in the original question of this thread, but I have seen it in real life often enough to bring it up in this context.
Ralph Stuart, CIH, CCHO
Environmental Safety Manager
Keene State College
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