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1987 UNIFORM BUILDING CODE,VOLUME 1 <br /> than 16 inches(406 mm)below the inlet and the cleanout shall be <br /> . located where it is accessible above the plug. If the plug is located <br /> less than 6 inches(152 mm)below the inlet,the inlet may serve as <br /> the cleanout. <br /> 3102.5 Factory-built Chimneys and Fireplaces. <br /> 3102.5.1 General. Factory-built chimneys and factory-built fire- <br /> places shall be listed and shall be installed in accordance with the <br /> terms of their listings and the manufacturer's instructions as speci- <br /> fied in the Mechanical Code. <br /> 3102.5.2 Hearth extensions. Hearth eactensions of listed factory- ���� �L�0 N <br /> built fireplaces shall conform to the conditions of listing and the �� v�/G�/Y1�S <br /> manufacturer's installation instructions. �(��S �S .�i{� �NL y <br /> 3102.5.3 Multiple venting in vertical shafts. Factory-built � �2 � Q�o�� <br /> chimneys utilized with listed factory-built fireplaces may be used in � �v �D �r�� � <br /> a common vertical shaft having the required fire-resistance rating. � � ��,Q <br /> 3102.6 Metal Chimneys. Metal chimneys shall be constructed �--r/t-C P� T. ��P ..��e <br /> and installed to meet the requirements of the Mechanical Code. `�� �L'79 S r <br /> Metal chimneys shall be anchored at each floor and roof with two /�/A r v G� o�� T � <br /> 11/2-inch-by-1/g-inch (38 mm bY 3.2 mm) metal straps looped �r r/ n./�U '� � /�tiC�• <br /> around the outside of the chimne installation and nailed with not /' � /w <br /> l e s s t h a n s i x 8 d n a i l s p e r s t r a p a t e a c h j o i s t. �� � ( r� � �i N I� <br /> 3102.7 Masonr y and Concrete l�replaces and Barbecues. ����N e i� � � /�PS�G� /�Q2 f�� <br /> 3102.7.1 General. Masonry fireplaces,barbecues, smoke cham- l /(�' �°'M t <br /> bers and fireplace chimneys shall be of masonry or reinforced \IU V �UJ�� ��` �� <br /> concrete and shall conform to the requirements of this section. 1 �/N �,�U �� <br /> 3102.7.2 Support. Masonry fireplaces shall be supported on �, j�7-{ (::/V����e � <br /> foundations designed as specified in Chapters 16, 18 and 21. / V e �� �q �� <br /> When an approved design is not provided, foundations for ma- �V�S/��� � �2 ���� <br /> sonry and concrete fireplaces shall not be less than 12 inches(305 ���5 /-� <br /> mm)thick,extend not less than 6 inches(152 mm)outside the fire- / ��� .r- <br /> place wall and project below the natural ground surface in accord- � v � <br /> ance with the depth of foundations set forth in Table 18-I-C. � �✓�S%"�'v�- p��� <br /> 2' `�2 F <br /> 3102.7.3 Fireplace walls. Masonry walls of fireplaces shall not �.� L�� <br /> be less than 8 inches(203 mm)in thickness.Walls of fireboxes shall `�,�N K /� �/Q'��'�� �N <br /> not be less than 10 inches(254 mm)in thickness,except that where a � '� <br /> UA"c,Cl—P <br /> lining of firebrick is used,such walls shall not be less than a total of 8 / � � � RS <br /> inches(203 mm)in thickness.The firebox shall not be less than 20 (�1����'� � ��,/� <br /> inches (508 mm) in depth. Joints in firebrick shall not exceed 1/4 � e �N Q��T J � - <br /> inch(6.4 mm). (/v�v� <br /> EXCEPTION:For Rumford fireplaces,the depth may be reduced to ���/�s <br /> 12 inches(305 mm)when <br /> 1.The depth is at least one third the width of the fireplace opening. ///��� �/��'}� <br /> 2.The throat is at least 12 inches(305 mm)above the lintel and is at �/ / <br /> least 1/Zp of the cross-sectional azea of the fireplace opening. v <br /> �3102.7.4 Hoods. Metal hoods used as part of a fireplace or barbe- <br /> cue shall not be less than 0.036-inch(0.92 mm)(No.19 carbon sheet � Z_;Z� _�� <br /> steel gage) copper, galvanized steel or other equivalent corro- <br /> sion-resistant ferrous metal with all seams and connections of smo- <br /> keproof unsoldered constructions. The hoods shall be sloped at an <br /> angle of 45 degrees or less from the vertical and shall extend hori- <br /> zontally at least 6 inches(152 mm)beyond the limits of the firebox. <br /> Metal hoods shall be kept a minimum of 18 inches(457 mm)from <br /> combustible materials unless approved for reduced clearances. <br /> 3102.7.5 Metal heat circulators. Approved metal heat circula- <br /> tors may be installed in fireplaces. <br /> 3102.7.6 Smoke chamber. Front and side walls shall not be less <br /> than 8 inches (203 mm) in thickness. Smoke chamber back walls <br /> shall not be less than 6 inches(152 mm)in thickness.A minimum <br /> 5/8-inch-thick (16 mm) clay flue lining, complying with Sections <br /> 3503,3504 and ASTM C 315,shall be permitted to form the inside <br />