I have an opportunity to install a large observation hive in a 
commercial building as part of a food market kiosk.. 

A major concern is the length of the tube. Due to the locaton in a busy 
urban area we wanted to go straight up from the hive and out the roof 
(flat roof) to keep the bees away from the public sidewalks .

After perusing the web I found some reference to straight up access 
being a problem. How long is too long? The ceiling height is over 15 ft.

Does anyone have some experience with large indoor  installations 
and plumbing them to the outside world?  

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