Hi, We recently designed a science building and expect ground breaking in t he next two months. Hoods were a key piece of the design since we are tryin g to get the new building energy certified and we also had to meet NY state mandates for energy savings. We decided in conjunction with the SUNY Construction Fund Engineers and our EH&S Officer to go with High Efficiency Variable Air Supply Hoods . As I understand it, the air flow into the hood varries with the sash opening. It also uses a different containment approach with vortex creation as opposed to laminar flow across the face. The hoods will be installed with both vert ical and horizontal sashes to minimize the amount of open face. In terms of our processes, we decided to forgo using high hazard materi als in the hoods so that the hoods could be combined into a few plenums with hea t exchnagers. Otherwise, each hood would have to had its own ducting and n o heat exchangers. That is code in NY State. This required us to revisit how we did certain experiments with bromine and HF. Also, we decided that an y experiments with perchloric acid would be rengineered. This allowed us t o avoid the issues with special systems for washing hood ducts for hoods wh ere perchloric acid has been used. We visited sites where these hoods were installed and were satisfied wi th their operation. I'd be interested to hear how people keep high hazardous materials contained when they are working with them in a hood system.
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