My oil furnace has a Field Controls model "DR" which is not painted. It's not shown on their website. Must be a economy model.
I've never seen it move once.
The RC is doing the watusi on the Alaska, I was just watching it. The wind blows, the manometer shows the draft start to rise, the RC opens, the draft goes back to -.025. The wind blows again.........
The Harman RC stays open, just keeps moving to compensate.