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3.4 Wall Enclosure Rough Opening • If masonry is to be used(optional), prepare the necessary <br /> foundation for the masonry load.When masonry construction <br /> WARNING: Provide adequate clearances around air openings is to be used,a lintel must be used over the top of the <br /> into the combustion chamber. Provide adequate clearance in appliance to support the additional weight. <br /> front of the fireplace for barrier removal, component access, <br /> gas line installation,service access,etc. • If installing the optional heat duct kit,refer to Section 4.0 <br /> #970 Heat Duct Kit on page 13. <br /> • Framing dimensions should allow for wall covering thickness <br /> and fireplace facing materials. If using a hearth,adjust the <br /> rough opening size as necessary to maintain minimum <br /> clearance requirements. <br /> \• <br /> SINGLE VERTICAL <br /> HEADER BOARD IS <br /> REQUIRED TO MAINTAIN <br /> ♦ CLEARANCES TO <br /> COMBUSTIBLES <br /> E <br /> \ \ (1168mm) <br /> 461/4• <br /> (1175mm) <br /> 1/2"(13mm)TYPICAL (5446mm)* <br /> FINISH MATERIAL <br /> *INCLUDES 1/2" (13mm)TYPICAL FINISH <br /> MATERIAL WITH FLUSH MOUNT <br /> Figure 3.3,Finished Opening Dimensions <br />