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, 3. Butt Joint With Cotiar Cross Sectian View With the butt joint and collar method, adjacent blankets are butted tightiy together and 6 in.(152 rnm) wide collar of duct wrap is centered over the joint, overlapping each b{anket by 3 in. {76 mm}minimum as shown in Figure 1. . 1. {3ne Layer 3M'''" Fire Barrier Duct Wrap 615-r Figure iC 2.Stee! Banding 112 in. (13 mm)Wide Min.Typical 6„ {t5z mma ; 5. 6 in. (152 mm) Min.Wide 6i5+ar 20A Collar 3" {76 mm) _._. 6. Firmly Butted Jaint 1-1/2" (38 mm) 1-1/2" (38 mm) 2 � 1 6 System integrity is limited by quality of installation. Consult Current Independent Testing Laboratories{{ntertelc, UL) For Design or System Details. !n all thres 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 far all three insta!latian methods listed above. For Banding Only(See Figure 1) For Mechanical Fastening with Pins Onty Filament tape can be used to temporarily ha{d 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 1-112 in. (38 mm}fram stee! banding is applied around the duct 1-1I2 in. each edge of the blanket, and spaced a maximum of (38 mm)from each edge of the blanket, and ma�cimum 10-1/2 in. (26,7 cm) on center along perimeter overlap, ' 10-�J2 in. (26,7 cm}centars.The banding is placed and a maximum af 1 Q-1/2 'sn. {26,7 rnm)on centsr around the material and tighteneci so as to sufficientiy alang langitudinaf overlaps. The blanket is impaled hald the 3MT"'Fire Barrier Duct Wrap 615+ in place over the pins and held in place by galvanized speed against the duct,compressing the foi!but not cutting clips. (nsulatian pins that extend beyond the blanket the fail. wrap shal! be turned down to eliminate sharp points. lnsulated cup-head pins can be used at the same Additional Pinning to Preuent Saggrng of the Wrap spacing requirernents 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 pravided the hangar rods are at feast a horizontaf surface and an the outside face af a vertica! 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 blanicet width, length of the duct. Use a minimum 2 in.x 2 in.x 114 in. and a maximum of 12 in. (30 cm)apart in the direction (�Q mm x 50 mm x 6,35 mm)steel angle steel suppork of the blanket length. Refer to paragraph below for channei or SMACNA equivalsnt support system. more information an Mechanical Fastening with Pins. 5