I have a Smoke Vault 24. This morning I was getting ready for a smoke and I fired it up with no chip or water pan, bare burner. Had nice blue flame with a little bit of yellow tip. Put everything together, got it up to temp, put th3e meat in and a little while later something told me to look through the vent at the burner Top vent is wide open, sides are about half way. The flame I see is pretty much pure yellow so I open the side vents all the way. No change ...... but it is keeping temp just fine, purring along, small adjustments give me just what I need and I'm running 240 very consistently with the control knob right about half way, set just over medium. Should I be concerned with this? I thought the flame should always be blue unless it was starving for air. It's cooking fine but I want to make sure it's cooking efficiently and correctly