thanks to all! Second boil on our modified arch seems to be really improving the boil rate. Boiling great right now. Amazing what a little shielding does in directing air flow. My front pan is bubbling just like you said it would Riley, and BTW I'm really impressed by your knowledge of fire dynamics. I've learned a lot about fires from reading all your posts. Last week AUF was the sound my cats make throwing up hairballs. Now it's a whole different thing