5" galvanized china rain cap on 6" liner ?

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Oct 16, 2015
28
bc canada
Hi. I wonder if the restriction in size on this 5" china cap that is only actually a ring about 3" long, would in a way choke the air flow of the 6" liner down ? the 5" china cap is attached inside the liner with a stainless brand so it fits inside easy and works but not sure if it is really bringing down the size of the chimney if you know what i mean