Salutations Have a 3yr old Whitfield Advantage insert that has been acting up this year, hoping some one can confirm some thoughts I have. We bought it new from a dealer who insisted on installing a very long run of 3in pipe up an exsisting and very sound concrete/clay chimney, 35 feet from top to bottom with about 8 feet running down into the basement with a clean out cap. Stove is on the 1st floor with a t-fitting. My guess at the time was that the dealer was more interested in thier bottom line than my stove - $1,200 for the stove - over $2,200 for the 35 feet of stainless 3 inch installed... What can I say - we just didn't know. Anyway, we have been tripping the vacuum switch this year having, foolishly, not made time this summer to run a brush up the flue. I've cleaned vent quickly a couple of times when the stove tripped off - it works for several days - then trips again. So today I went at it hard and managed to drop what appear to be several clinkers from the top of the vent near the cap. They aren't shinny, so I don't think I'm creasoding up - they are just hard packed ash chucks about an inch square from the top of the vent. So - and please feel free to elabourate on any of the above as well - what I am wondering is what would be the problem if I knocked the 15 or so feet off the top of the vent and let it exhaust directly into the old chimmey? It's in fine shape and was working great for the oil furnace and heater we removed when the stove went in. I didn't know about this forum and would like to thank the folks hosting it for their hard work - it's a really useful read just on it's own and I think I have a really good tip to pass along regarding silencing and extending the life of auger motor later. Cheers and best wishes Jon.