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Possible Advantages:
1. Keeps Animals, especially Raccoons and Birds, from setting up home in your chimney or fireplace.
2. Keeps Rain and moisture from building up inside chimney. This can help reduce the chimney smell that often invades homes in the warmer weather.
3. Sheds ice and rain from the chimney crown, which is the cement cover on the top of the chimney structure. This will extend the life of the crown and eliminate some causes of cracking of the flue tile.
4. Increase draft of chimney, especially in areas with constant wind.
not totally necessary but it may save you on costs and aggravation later on
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