I never go-away...... .......
I have practiced the ff culture thing, however ( just incase there is an emergency)
A ff culture w 2 or 3 holes punched in the lid works well. ( I actually used a hole punch)
The flies do not all come out at the same time.
If the area is warm I think I would run a fan facing the enclosure (s) .
They are better cooler than warmer.

Let us know how you make out