I'm wondering if anyone with a PE Super 27 (or similar) shuts down the air ALL the way for overnight burns? FYI my stove is vented with outside air. I get good overnight burns so no worries there....I set the intake below the "Low" setting but not all the way closed, like open 10% or so. I've always been under the assumption I should not close the air down all the way...that a little air is good. But in the interest of even longer burns I'm wondering about just shutting it off. Will there be enough air coming through the secondary intake to keep it going efficiently and minimize extra creasote build up? Thx.