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It will be necessary to cut wall studs and install a header and sill frame to maintain proper dimensions and to hold the weight of the brick (Figure 11). 10 INSTALLATION USING MASONRY OR BRICK CHIMNEY Minimum 3 %" (89mm) [4" (102mm) nominal] thick solid bricks are to be used. The fire clay liner (ASTM C35 or equivalent), 5/8" (16mm) wall thickness, must not penetrate into the chimney beyond the inner surface of the chimney flue liner and must be firmly cemented in place. If it is necessary to