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Author Topic: Visibility Threshold for tenability assesment  (Read 902 times)

Murtaza Wasi

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Visibility Threshold for tenability assesment
« on: April 20, 2021, 12:23:35 am »

For manually coupling FDS results with Pathfinder to introduce the speed reduction factor (https://support.thunderheadeng.com/tutorials/pathfinder/manually-coupling-fds/) it is also mentioned in the Summary section that a user can choose to completely prevent entry to a room by closing doors as an alternate way for incorporating the effects of visibility in movement. But no value of visibility is prescribed as critical or threshold at/below which the doors are to be closed. Is there any particular value for this or any reference works/studies that can guide us through this problem?
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Bryan Klein

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Re: Visibility Threshold for tenability assesment
« Reply #1 on: May 21, 2021, 03:56:15 pm »

There is not a specific threshold, this would be up to engineering judgement.

There is a newer feature in Pathfinder to have agent automatically slow down in smoke.
https://support.thunderheadeng.com/docs/pathfinder/2021-2/user-manual/#_importing_fds_output_data
https://support.thunderheadeng.com/docs/pathfinder/2021-2/technical-reference-manual/#_occupant_slowing_in_smoke

They will not avoid smoke yet, and doors won't close to prevent movement through a smoke filled room.
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