Existing B vent too big for WH. Use as chase for new?

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rcbuilds

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I have an “orphaned” WH (used to share same vent as furnace before 95% was installed) in my home venting into an 8” Metalbestos chimney through the roof. I am replacing the WH with another atmospherically vented model and would like to run a new, appropriately sized 4” B vent from the basement all the way to the roof.
Given that the existing metal insulated chimney is so large, would I be able use the existing flue as a chase to run the new 4” up through the first floor, attic, and through the roof? Note that the 4” would be a completely separate B vent and would only be using the existing 8” as a chase, not tied in.

Thanks for your help!
 

Sylvan

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I see no reason why it will not work

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