>>A beekeeper who is very big top entrances propagandist here
suggests top entrances to be 3.5cm diameter.
I don't like drilling holes in my deeps. I place a ~1/4" (0.65 cm)
dia stick under the top insulating newspaper. The stick extends from
the inner cover hole to the edge of the inner cover. I find that the
moist air flows out of the hive well. I don't see mildew or mold
inside the hive. The newspaper absorbs a little moisture along the
stick but this does not compromise its insulating value.
I do have drilled holes in some of my medium honey supers to help
provide an airflow in the summer months.
>>I understand that slatted bottoms have some other adventages but I
didn't unify my hives, it is maybe not too much serious of me.
I've read/heard slatted racks reduce swarming but I have not seen any
comparisons with regular colonies.
Waldemar
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