> 
> "Most places East of the Mississippi River and South of Boston, MA have not
> had much snow in years, but we do have humidity.  It is this damp that we
> want to vent"

In UK we find that open mesh floors make top venting unnecessary as excess humidity inside the hive will always disperse.  Is that not true scientifically? 

Of course, if the top covers are disturbed after the bees have propolised them down - as happens when the ivy honey honey supers are removed in November - then there is a little top ventilation around the covers as it is too late for the bees to reseal. 

Robin 

             ***********************************************
The BEE-L mailing list is powered by L-Soft's renowned
LISTSERV(R) list management software.  For more information, go to:
http://www.lsoft.com/LISTSERV-powered.html