Would the arm, to open and close it, point out-ward or in-ward (toward the chimney wall)? We just bought this house and are clueless.
The simplest way to tell is to strike a match and hold it close to the fireplace opening. If the lit match is drawn in the direction of the fireplace as if there is wind blowing – trying to send it up the chimney, your flue is open. If the lit match appears to simply stay straight up and simply burn itself out, then you flue is closed. If lighting and holding a match does not appeal to you, then use a candle. The open or closed flue will have the same effect.
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