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> ' <br /> Figure 2 <br /> 3MT'" Fire Barrier Duct Wrap 615+ <br /> Commercia!Kitchen Grease Duct Systems <br /> 1 or 2 Hour Access Doar System � <br /> 1.Access Hale <br /> 2. 1l4 in. (6 mm) Dia. Ali Threaded Rods � <br /> � 3. Access Cover-16 Gauge � � .� 6 � <br /> 4. Insulation Pins-Welded � , g <br /> 5. First Layer 3MT"' Fire Barrier Duct Wrap 615+Cut . 4 <br /> Same Size As Cover "�� �� <br /> 6. Second Layer 3MT"' Fire Barrier Duct Wrap 615+ g ° ��� <br /> with 1 in. (25 mm) Overlap On All Sides <br /> 7. Third Layer 3MT"' Fire Barrier Duct Wrap 615+with ��� <br /> 1 in. (25 mm) Overlap On All Sides <br /> 11 <br /> 8. Spaed Ciips <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. 114 in. (6 mm} Diarrreter Wings Nuts (lnterCefc, UL} For Design or System Details. <br /> Access Door tnstafiation <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 ta the duct at the carners of the door opening. Faur stee!tubes,each 3 in. (76 mm)lang, are placed <br /> over the rods to act as protection for the 3MT"' Fire Barrier Duct Wrap 615+when fastening the door, Four <br /> . insulation pins are welded to the daor panel for instaliation af the blanket. One fayer af 3MT"' 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.tt is essential that this layer fit trghtly against the wrap surrounding the access door opening wifh no <br /> fhrough apenings. A second layer of 3MT"' 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 iayer af 3MT"'Fire Barrier Duct Wrap 615+is cut so as to overlap the second <br /> layer by a minimum of� in. (25,4 mm).The third layer is impaled aver the pins and ai1 three layers are lacked in <br /> place with galvanized or stainless steel speed clips. Pins that extend beyond the outer layer of 3MT"' Fire 8arrier <br /> Duct Wrap 615+shalf be turned down to avoid sharp points an the door.The insulated door panel is placed over <br /> the threaded rads and heid in place with washers and wing nuts.The details are shown in Figure 2. <br /> 6 <br />