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Figure 2 <br /> 3MTm Fire Barrier Duct Wrap 615+ <br /> Commercial Kitchen Grease Duct Systems <br /> 1 or 2 Hour Access Door System 1 <br /> 1.Access Hole <br /> 2. 1/4 in. (6 mm) Dia.All Threaded Rods 5 <br /> 3. Access Cover— 16 Gauge 6 7 <br /> 4. Insulation Pins—Welded g <br /> 5. First Layer 3MTm Fire Barrier Duct Wrap 615+ Cut 4 <br /> Same Size As Cover .0 o� <br /> 6. Second Layer 3MTm Fire Barrier Duct Wrap 615+ <br /> with 1 in. (25 mm) Overlap On All Sides <br /> 7. Third Layer 3MTm Fire Barrier Duct Wrap 615+ with 10 <br /> 11 <br /> 1 in. (25 mm) Overlap On All Sides <br /> 8. Speed Clips <br /> 9. Aluminum Tape Covering All Exposed Edges System integrity is limited by quality of installation. <br /> 10. Spool Pieces For Threaded Rods Consult Current Independent Testing Laboratories <br /> 11. 1/4 in. (6 mm) Diameter Wings Nuts (Intertek, UL) For Design or System Details. <br /> Access Door Installation <br /> Four galvanized steel threaded rods, 1/4 in. diameter(6,35 mm) by 4-1/2 in. to 5 in. long (114 mm to 127 mm) <br /> are welded to the duct at the corners of the door opening. Four steel tubes, each 3 in. (76 mm) long, are placed <br /> over the rods to act as protection for the 3MTM Fire Barrier Duct Wrap 615+when fastening the door. Four <br /> insulation pins are welded to the door panel for installation of the blanket. One layer of 3MTm Fire Barrier Duct <br /> Wrap 615+ is cut approximately the same size as the access panel and impaled over the insulation pins on <br /> the panel. It is essential that this layer fit tightly against the wrap surrounding the access door opening with no <br /> through openings. A second layer of 3MTm Fire Barrier Duct Wrap 615+ is cut so as to overlap the first layer by a <br /> minimum of 1 in. (25,4 mm). A third layer of 3MTm Fire Barrier Duct Wrap 615+ is cut so as to overlap the second <br /> layer by a minimum of 1 in. (25,4 mm). The third layer is impaled over the pins and all three layers are locked in <br /> place with galvanized or stainless steel speed clips. Pins that extend beyond the outer layer of 3MTm Fire Barrier <br /> Duct Wrap 615+ shall be turned down to avoid sharp points on the door. The insulated door panel is placed over <br /> the threaded rods and held in place with washers and wing nuts.The details are shown in Figure 2. <br /> 6 <br />