May 12, 2014 7022-122D Page 11Castile Pellet InsertAB CDD. Minimum Opening for Masonry andFactory-Built FireplacesInches MillimetersA Insert side to combustible side wall 16 406B Insert top to mantel 12 305C Insert top to maximum. 2-1/4 inch(57mm) face trim4-3/4 121D Insert side to maximum. 2-1/4 inch(57mm) face trim10 254Location Inches MillimetersA Rear Width 23-5/8 600B Depth 17 432C Height 21-1/4 540D Front Width 28-1/8 714Figure 11.1C. Masonry and Factory-Built FireplacesInches MillimetersE Floor protection hearth extension fromdoor opening 6 152F Floor protection to the side of dooropening6 152F. Floor ProtectionFigure 11.2Side WallMantelMaximum Mantel Depth: 12 inches (305mm)FaceTrimEFA DCBG. Prefabricated Metal ChimneyThe chimney can be new or existing, masonry or prefabricatedand must meet the following minimum requirements:• Must be minimum 6 inch (152mm) inside diameter ofhigh temperature chimney listed to UL 103 HT (2100 o F)or ULC-S629.• Must use components required by the manufacturer forinstallation.• Must maintain clearances required by the manufacturerfor installation.• Refer to manufacturers instructions for installation•The original factory-built zero clearance fireplace chim-ney cap must be re-installed after installing the approvedchimney liner meeting type UL 103 HT requirements(2100°F) per UL 1777.•If the chimney is not listed as meeting HT requirements,or if the factory built fireplace was tested prior to 1998, afull height listed chimney liner must be installed from theappliance flue collar to the chimney top.•The liner must be securely attached to the insert flue collarand the chimney top.•The air flow of the factory-built zero-clearance fireplacesystem must not be altered. The flue liner top supportattachment must not reduce the air flow for the existingair-cooled chimney system.•No dilution air is allowed to enter the chimney.1. Secure the fireplace damper in the open position. Ifthis cannot be accomplished, it will be necessary toremove the damper.2. Seal damper area of chimney around chimneyconnector with a high temperature sealant or sealinsert against the face of the fireplace.3. Both methods must be removable and replaceablefor cleaning and re-installation.NOTEIt is necessary to permanently seal any opening betweenthe masonry of the fireplace and the facing masonry.If employing a hearth extension, any parts or materials used in construc-tion must be non-combustible.E. Hearth Extension