Seth >   OB hive without bees https://www.youtube.com/watch?v=IZ22fhs27oo
OB hive with bees https://www.youtube.com/watch?v=G2lftDvZzfg

It looks like in both videos, there's a higher concentration of vapor lower in the box, but it's not easy to tell from a fixed angle.  

Over the years, at times, I've had mixed results controlling varroa with OAV, and it may be from poor distribution influenced by nozzle placement (using ProVap 110) or environmental factors like wind speed,  temperature, humidity and maybe even atmospheric pressure. There are times when vapors will exit from all over including the top, sides and bottom and other times I don't notice any significant vapor loss - not sure which scenario is better.  An application protocol that considered variables might be helpful.  


BTW- no matter what PPE you chose when vaporizing,  you must perform functional tests that determine fumes are actually being eliminated, and they must be periodically repeated during use. OSHA's standards for protection when using organic acids are a good guide. 


Bill Hesbach
Cheshire CT 

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