@ch4man, that one was decent sized. IIRC 500k at low fire, 4:1 turndown, ≈ 2,000k. I was adjusting it via combustion analyzer/ΔT, I was just looking for verification. You can't know too much about things, especially burning that much gas.
<rant>Had a makeup air unit, 3,800k BTUh. The plumber piped it in 1" from the regulator to the unit, about 25' equivalent length, because "it'll be fine and anyway thats what the unit had". <sigh> And people wonder why I'm against sizing gas lines for greatest possible pressure drop.</rant>
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