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Twin wall flue system design, number of ceilings penetrated

How many ceilings will the flue pass through for a twin wall flue system The number of ceilings penetrated by the flue includes ceilings below floors as well as the ceiling to a loft space. Please do not count any vaulted ceilings - if you have a vaulted ceiling then please let us know in the notes section of your flue design application.