[labnetwork] Combined or separate exhaust?

[Massey, Travis]

Hi all,

LLNL is planning a significant cleanroom expansion, and the question arose whether we need separate exhaust for hoods and tools/gases, or if they can be combined into a single shared exhaust.  Or do you have a single exhaust with 2+ exhaust fans pulling simultaneously, so there's always some exhaust air moving if one fan is down?  The conventional wisdom around here has its share of holes, so I'm out to learn from the broader nanofab cleanroom community.  How are your cleanrooms' exhaust systems are configured, especially if you've had to go down this cleanroom design rabbit hole?

I'm also broadly open any other lessons learned regarding provisioning exhaust or other utilities - whatever you feel like sharing.  Too much information during the design phase is far better than too little.

Thanks,
Travis Massey
Center for Micro and Nano Technology (CMNT)
Lawrence Livermore National Laboratory (LLNL)
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