Recent Examples on the WebMake sure the chimney flue is open and that the vent has been swept at least once during the last year. Joe Mario Pedersen, orlandosentinel.com, 28 Jan. 2022 All of the dead collapsed and died after being overcome by smoke while trying to descend down the stairway, which acted as a flue for the heavy smoke.Fox News, 17 Jan. 2022 Just inside the front door to the left sits one of only three split-flue fireplaces in Old Louisville. Lennie Omalza, The Courier-Journal, 24 Nov. 2021 If using a fireplace, make sure the chimney flue is open and stay awake while the fire is burning. Dr. Mishal Reja, ABC News, 19 Feb. 2021 The damper should operate freely, and the flue should be free of any creosote buildup. John Nugent, Chron, 31 Oct. 2020