>>I think you have it reversed the screen funnel is between the nuc
and the opening in the house/tree, the other nucleus entrance ids to
open air.
I see. So the funnel could be solid and used like a bee escape
that's one-way into the nuc. I guess the end diameter of the funnel
on the nuc side would have to be just large enough to let a queen
pass through.
I like this idea. Just about the only good way (other than trying to
drum the bees out or drive the bees out with a bee propellant) to get
the queen out of a tree nest.
Waldemar
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