Chimney flues and chimney pots - Smoke Test and Identifying. http://www.fixmyroof.co.uk/videos-and-guides/chimneys/chimney-capping
This videos deals with the basic issues in understanding and identifying which chimney pot is connected to which flue, and then in turn to a particular fireplace. Once you know the basics of construction it removes a little bit of the mystery, so even if your chimney flues are not exactly the same it may help.
Always test with a good smoke bomb or pellet to confirm or crush your theory, that's shown too.
I then show you how to measure a chimney pot from the floor so you can work out the internal size and the outside diameter, very handy for fitting chimney cowls or chimney caps.
Remember, blocking off the wrong flue could be very dangerous, if in any doubt call in a professional !!!
Chimney cap video here : http://youtu.be/Ge3SoeBOPOI
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