We bought a Jotul Oslo and are having the dealer install it. We are replacing an old Garrison. Reading the manual I'm not sure if we need to line chimney or not. Our house was built in 1992 and this chimney has two separate flues. Removing the pipe my husband measured flue at 6x10. This stove will be in our basement. Chimney was cleaned and inspected last September and will be cleaned again for install. The pipe connecting to flue has some build up but not flue as far as we can see. We were burning our Garrison to low of heat and the current venting is poorly designed. Manual on page 6 says: "The fireclay flue liner must have nominal size of 8”x8” and should not be larger than 8”x12”. …. If Chimney with larger dimension is to be used, it should be relined with an appropriate liner that is code approved." Our take is we do not need to line our chimney. It is significantly less expensive install not to put in a liner as both install cost and parts cost drop and will save us $500 or more. Here is where it will go and dealer will make venting straighter and with double wall venting. Do we need to line the chimney per Jotul's manua? If not is there any reason should we consider having chimney lined? Thanks for your help.