timers on ventilation systems

[Guest guest]

Can anyone point me to some good guidance documents on the issue of what time to start introducing the required amount of outdoor air in the mornings? ASHRAE

seems to only require the minimum outdoor air during occupancy. But my concern is build-up of VOCs overnite. I am dealing with a new office building that shuts the ventilation off after 5 pm. A few occupants experiencing irritation/asthma soon after starting

work.

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