The double brush debate at the regional meeting yesterday

I sat in on the demo in Portland where a guy swore twin rotary brushes cut his flue time in half. In my experience, they leave more creosote on the smoke shelf than a single head does on aged liners. We ran a side by side on a 2 story house off Burnside and the single pass still needed a follow up scrape. Anyone else tried both setups and landed on old school for tricky stacks?

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