house built in 1939. Water is leaking inside the basement, right where the flue pipe enters the brick chimney. The pipe is type b metalvent double wall pipe coming from furnace to the chimney, and it appears to change over to the stainless steel flexible flue liner, from what I can see. I am assuming this goes all the way up to top of chimney. Due to roof pitch and frost, I can not get on top to inspect. there is a constant drip coming out of here, It was about 25 degrees outside. there are not water lines in the area. To much water to blame on rainfall. All I can figure is condensation. If it is condensation, what can they do about it? I recommended HVAC guy, but once again, I want to know what is going on here and what is causing it.