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Subject:
Re: Upper Ventilation in Winter: Moisture exchange and heat loss
From:
Bob Darrell <[log in to unmask]>
Reply To:
Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
Date:
Tue, 15 Dec 2020 10:11:23 -0500
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> 
> Right, I have seen notched inner covers, and people suppose that notch serves as an "upper entrance" which I don't believe it does, since it does not let in any light. To me that's no entrance at all and probably has very little effect on air flow. 


I use ‘notched inner covers’ with reduced bottom entrances and have since the ‘70s.  The bees use the top entrance almost exclusively for cleansing flights.  On cold still bright days a whisp of vapour can be seen emitting from this top entrance.

Bob Darrell
Caledon Ontario
Canada 44N80W
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