chimney down draft

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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.