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B • 12/08 7 77 Installation Preparation Prepare the existing solid fuel masonry or factory built non-combustible firebox for installation. A. Inspection and Cleaning Prior to installing the gas insert: • Have the chimney and adjacent structure inspected and cleaned by qualified professionals. Hearth & Home Technologies recommends that NFI or CSIA certified professionals, or technicians under the direction of certified professionals, conduct a minimum of a NFPA 211 Level 2 inspection of the chimn