This is a side topic. One of the first controlled flushing project was titted "The Tripp slope project". Kinda of a dry run for later and larger projects. Tom Supey who was involved in some of the larger projects ( but not Tripp slope) told me that they used natural ventilation on that one. Said the guys had it horrible. Only able to work half a day because the black damp would creep up on them as daytime temps. increased. Needless to say on later projects the fans were installed.

yea i remember that story, thats a good one!

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