Like I said before the chimney is clean so It is not coming from that.
I can not use a damper in the pipe according to US Stove co. They told me to put in a barometric damper.
Any other suggestions?
Ignore what us stove told you, most stove manufacturers will tell you not to put in a key damper but in the real world they are necessary in installations with chimneys taller than 20ft. A barometric damper is not what you need.
![[Hearth.com] chimney down draft [Hearth.com] chimney down draft](https://www.hearth.com/talk/data/attachments/346/346561-3bcd6455edd655f6869cb215dd8e7213.jpg?hash=E2B_cvGAcP)
![[Hearth.com] chimney down draft [Hearth.com] chimney down draft](https://www.hearth.com/talk/data/attachments/346/346565-d6cd0c717033c1f4bcc318c7b49e3e26.jpg?hash=V3q2VN4G56)