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1. When a round flue is used for the lining of a fireplace chimneythe properfireplace opening to flue size ratio should be: -Correct answer-12:1 2. When unlined the smoke chamber walls shall be what thickness: -Correct answer-8" 3. When the opening of the firebox is 6 square feet the extensionof the hearthshould be: -Correct answer-20 inches