SnappyHex mesh doesn't seem to work

Hi Devang,
many thanks, the file is here:
180702_01_0_outdoor_airflow_VM2.gh (529.8 KB)

Not sure re the the analysis plane you are mentioning, I tried something but notheing changed (see in capital letters on teh bottom on the file), but the base of this file is the example downloaded to follow video 4…

Please also see the additional notes I wrote in answer to Theodore just now here:

Many thanks.
Viola