Vaping from above / through the crownboard

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I have a few ekes...not enough for all of the colonies....must make more
I do close off the OMF but not the entrance
 
Have been vaping from the top by lifting the clear crownboard enough to poke my gasvap pipe in, which is over a small eke for fondant feeding. Just wrapped an old towel around the edges to plug the gaps and left the varroa boards underneath. Seems to have worked ok with high-ish drops from two hives and the vapour sinking down between the frames....
 
As a test (just to see) I lifted the roof/CB off a hive that had an empty brood box (used as feeding fondant slabs) few minutes after injecting 2.5g through the entrance, clouds of vapour poured out the top. In fact I could just about see the blue fondant bag.

Can cover a site of 30 units in less than half an hour and it looks like most of the vapour stays inside the hive.
 
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