The word is "flue" not "flute." Both the outside air control and the damper should be open while a fire is burning. You may close both of them when there's no fire, but you don't have to. If you leave them open, you'll just lose heated air up the flue and get a draft from the combustion air opening.
source https://www.inspectorsjournal.com/topic/17593-gas-fireplace-lever/?do=findComment&comment=174650
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