Thanks guys - no such thing as too much info! As you know I'm trying hard to replicate #1010 and wanted to incorporate the vent, don't know how much added airflow it provides but I would image if it was useless, they wouldn't have done it? (ANY extra airflow would be great...)
If anyone has info or pics of this vent let me know, I would appreiciate it!
Cheers
Chris
PS: Thanks to Chris Melia for the color reference pic-