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shine a light up the chimney and you should see a metal plate or door with a handle on one end that can be adjusted to be vertical (or open-allowing you to see completely up the chimney or adjusted so that it is completely flat and completely blocking the opening (closed) common sense here. It's simply a door,. opening or closing the flue which is always in the open position when having a fire in the fireplace and is always in the closedpositioned when the fire is completely out and never closed unless the fire is absolutely and positively out!!! For a fireplace to not have a damper (door) would be practically unheard of these days, but, if you check and there is none simply buy a cover or make one yourself and use it only when no fire is present

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Q: Your chimney allows cold air into the house. How do you close it off?
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