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3. Butt Joint With Collar Cross Section View With the butt joint and collar method, adjacent blankets are butted tightly together and 6 in. (152 mm) wide collar of duct wrap is centered over the joint, overlapping each blanket by 3 in. (76 mm) minimum as shown in Figure 1. 1. One Layer 3MTM Fire Barrier Duct Wrap 615+ Figure 1 C 2. Steel Banding 1/2 in. (13 mm)Wide Min. Typical 6" (152 mm) 5. 6 in. (152 mm) Min. Wide 615+ or 20A Collar 3" (76 mm) 6. Firmly Butted Joint 1-1/2" (36 mm) _1-1/2" (38 mm> 2 5 1 6 System integrity is limited by quality of installation. Consult Current Independent Testing Laboratories (Intertek, UL) For Design or System Details. In all three overlap techniques the perimeter overlap can occur at any location on the duct. The blanket is mechanically attached to the duct by steel banding or by welded insulation pins and clips for all three installation methods listed above. For Banding Only (See Figure 1) For Mechanical Fastening with Pins Only Filament tape can be used to temporarily hold the Insulation pins are welded to the duct in the centers of blanket in place until the banding is applied. The the overlaps a minimum of 1-1/2 in. (38 mm)from steel banding is applied around the duct 1-1/2 in. each edge of the blanket, and spaced a maximum of (38 mm)from each edge of the blanket, and maximum 10-1/2 in. (26,7 cm) on center along perimeter overlap, 10-1/2 in. (26,7 cm)centers. The banding is placed and a maximum of 10-1/2 in. (26,7 mm) on center around the material and tightened so as to sufficiently along longitudinal overlaps.The blanket is impaled hold the 3MTM Fire Barrier Duct Wrap 615+ in place over the pins and held in place by galvanized speed against the duct, compressing the foil but not cutting clips. Insulation pins that extend beyond the blanket the foil. wrap shall be turned down to eliminate sharp points. Insulated cup-head pins can be used at the same Additional Pinning to Prevent Sagging of the Wrap spacing requirements of the insulation pins. For Ducts 24 in. (60 cm)and larger in width, additional NOTE: Support hangar systems do not need to be pins are needed to support the blanket on the bottom wrapped provided the hangar rods are at least a horizontal surface and on the outside face of a vertical minimum of 3/8 in. (9,53 mm) diameter and spaced duct run. Space pins a maximum of 10-1/2 in. a maximum of 60 in. (152 cm) on center along the (26,7 cm) apart in the direction of the blanket width, length of the duct. Use a minimum 2 in.x 2 in.x 1/4 in. and a maximum of 12 in. (30 cm) apart in the direction (50 mm x 50 mm x 6,35 mm) steel angle steel support of the blanket length. Refer to paragraph below for channel or SMACNA equivalent support system. more information on Mechanical Fastening with Pins. 5