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Two barometric dampers or one larger one?

Dave MDave M Posts: 36Member
My 32-foot tall interior chimney has a bit too much draft. The Fields documents recommend a 7-inch draft regulator on a 6-inch flue if the chimney is greater than 16 feet high. Trying to decide between a 7-inch damper vs adding a second 6-inch damper. What is the neatest way install a 7-inch damper in a 6-inch smoke pipe? Current setup is Peerless WBV-04 oil boiler with a single 6-inch damper. Can’t get the over fire draft down to -.02. Peerless recommends -.01 to -.02. Best it gets is -.03 to -.04. Have two draft gauges, the big MZF and the pocket version, both Bacharach.

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