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the cerrterline of the venting system � <br /> on the ceiling and drill a small hole <br /> through the ceiling and roof at tl�is <br /> paint. From the roof, locate the drill <br /> hole and ma�lc the outline of the G�+� r"�u" <br /> Cathedral Ceiling Support Box. w��eox Fl�� <br /> Step 3. Remove shingles or other ��"G <br /> roof covering as necessary to cut the <br /> redangular hole for t!�Suppat Box ---I �����' <br /> (refer to Table 1 for dimensions). su�B�"ox <br /> Cut the hole 1/8-inch larger than tlie F�9��2a <br /> Support Box outline. <br /> Step 4. Lower the Support Box <br /> through tl�e hole in the roof until <br /> Support Box protrudes at least <br /> 2-inches below the low side of the <br /> ceiling (Fig. 20)_ Align the Support . <br /> Box both vertically and horizontally <br /> with a level.Temporarily tadc the <br /> Support Box in place through <br /> the inside walls and into the roof <br /> sheathing_ <br /> Step 5. Using tin snips,cut the ' <br /> Support Box from the top comers <br /> down to the roofline, and fdd�e <br /> resulting flaps over the roof sheathing. <br /> The flaps may be trimrr�ed as needed Figure 21 <br /> (Fig. 21). Before nailing it to the roaf, <br /> run a bead of non-hardening sealarrt <br /> around the Suppat Box,to make a <br /> seal beiween the Support Box and <br /> the roof. Clean out any combustible <br /> material from inside the Support Box. �� �uM <br /> Step 6. Follow Steps 4 and 5 <br /> (page 14}of the Vertical Installation <br /> Instrudions. <br /> Step 7. Place the Support Clamp <br /> (provided with the Support Box)inside ��TM��� <br /> the Support Box(at the bottom), sur�r <br /> and secure to the Pipe Section. � <br /> The Clamp allows the Support Box � <br /> to suppo�t the weight of the Pi� Figure 22 <br /> 17 <br />