Posted By Julian Meer (work)
Are any colleagues aware of any models or research papers that predict the ingress of toxic gas into a "normal" buliding (assuming doors /windows shut, air con. off etc.)as a function, say, of external gas concentration and building design?

I am well versed in the design of gas tight refuges but need such a model to decide whether a full blown gas tight refuge is needed or shelter in place procedures ("masticking" of window frames, towels under door, etc.) would potentially suffice.

Anyone who has gone through the HSE's/CIA's Occupied Building Risk Assessment for COMAH sites should be able to identify with this.