Posted By Paul Phillips Can anyone help, I need to find out the standards required to pressurise building to prevent the ingress of airborne gasses from external sources. I have contacted the Fire Service, The HSE, and local Building Regulations officers and none of them seem to have an answer.

Posted By Ron Hunter You should relocate to a planet with a more benign atmosphere! I'm so sorry, I couldn't resist, but I am curious about the particular nature of your business.

Posted By Paul Phillips Ron, I work on a business park, next to another industry which could produce airborne gasses to atmosphere, We have some buildings that are designated as safe for people to go into in such an event. The problem I have is that we are refurbishing some older buildings and we have to make sure that we do not make them unsafe in relation to the above. However, no one can tell me what standards were used to designate them in the first place, and none of the agencies have any information. I wish I could re-locate to another planet some times but it's a problem I'm stuck with it. can you help

Posted By Ross Stirton Standards exist for Offshore Production Installations in DIN EN ISO 15138. Yours for 200 Swiss Francs (£88.40)! Design aims for minumum 50Pa overpressure to prevent ingress of gasses. Regards, Ross

Posted By Ross Stirton Spoke to our HVAC Engineer. His reference standard is the Institute of Petroleum code IP 15; http://www.energyinst.org.uk/index.cfm?PageID=1005 Regards Ross