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19 <br /> 4.4 OFFSET CHIMNEY INSTALLATION <br /> • ` <br /> CHIMNEY SECTIONS INSTALLED BETWEEN AN OFFSET AND RETURN REQUIRE STRUCTURAL <br /> SUPPORT TO REDUCE OFF-CENTER LOADING AND TO PREVENT CHIMNEY SECTIONS FROM <br /> SEPARATING AT THE CHIMNEY JOISTS. <br /> THE CHIMNEY SHOULD NOT BE BUILT WITH AN OFFSET ANGLE IN EXCESS OF 45°IN CANADA AND <br /> 30°IN USA.DO NOT COMBINE OFFSET CHIMNEY COMPONENTS TO EXCEED THESE ANGLES. <br /> The first flue offset closest to the top of the unit must <br /> be a minimum distance of 12"(304.8mm)from the top _Rain Cap <br /> of the appliance. <br /> Storm Collar <br /> Attach an elbow to the chimney section,angled towardRoof <br /> the offset.Secure with 3 sheet metal screws. / \/-Flashing <br /> To achieve the minimum offset, attach and secure a Roof Joist <br /> second elbow.To achieve longer offsets,you may Al <br /> install any available length of chimney pipe between <br /> the elbows. Supports must be used on the first vertical Chimney Section ;1 <br /> chimney section after a return elbow. <br /> .—Attic Insulation <br /> Shield <br /> , I H4 <br /> Elbow Support <br /> Straps a Elbow Support <br /> Band <br /> Elbow <br /> Elbow <br /> IV 1 �/4/Floor,Ceiling Joist <br /> V� L\" Firestop <br /> If the offset length is <br /> more than 36" <br /> (914.4mm),an <br /> intermediate support <br /> must be employed. <br /> To achieve longer <br /> offsets,you may <br /> install any available <br /> length of chimney <br /> pipe between the <br /> elbows.The <br /> intermediate support <br /> must be used in <br /> conjunction with an <br /> offset support. <br /> 63.6A <br /> W415-1642/04.15.76 <br />