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Figure 1 <br /> 3MTm Fire Barrier Duct Wrap 615+ Commercial Kitchen Grease Duct Systems <br /> 1 or 2 Hour Shaft Alternative Zero Clearance to Combustibles <br /> Telescoping Wrap Technique With Banding For Ducts 24 inches (60,9 cm) or Less <br /> 1. First Layer 3MTm Fire Barrier Duct Wrap 615+ 2 <br /> 2. Second Layer 3MTm Fire Barrier Duct Wrap 615+ <br /> 4 <br /> 3. 3/4 in. (19 mm) Wide Filament Tape <br /> 4. Steel Banding 1/2 in. (13 mm) Wide Min. 5 <br /> Typical for Permanent Fastening 6 <br /> 5. 3 in. (76 mm) Min. Longitudinal Overlap <br /> 6. 3 in. (76 mm) Min. Perimeter Overlap <br /> System integrity is limited by quality of installation. 3 ass <br /> Ducts > 24 in. (60,9 cm) Wide Require Pinning on <br /> the Bottom Side. <br /> Consult Current Independent Testing Laboratoriesti <br /> (Intertek, UL) For Design or System Details. `a <br /> There are three (3) approved installation techniques for installing the <br /> 3MTm Fire Barrier Duct Wrap 615+ (See Figures 1A, 1 B, & 1 C): <br /> 1.Telescoping 3 in. (76 mm) Overlap Wrap <br /> Cross Section View <br /> Figure 1 A <br /> With the telescoping overlap wrap method, each <br /> 3'(76 mm) 3"(76 mm) <br /> blanket overlaps one adjacent blanket, and each <br /> blanket has one edge exposed and one edge 1-1/2'(36 mm) 2 1 3 1-1/2'(36 mm) <br /> covered by the next blanket as shown in Figure 1 A. <br /> The visible edges of the perimeter overlaps all point <br /> in the same direction. <br /> 1. One Layer 3MTm Fire Barrier Duct Wrap 615+ 21'(53.3 cm)Typ. <br /> 2. Steel Banding 1/2 in. (13 mm) Wide Min. Typical r <br /> 3. 3 in. (76 mm) Min. Longitudinal Overlap <br /> 2. Checkerboard 3 in. (76 mm) Overlap Wrap <br /> Cross Section View <br /> Figure 1 B <br /> With the 3 in. (76 mm) checkerboard overlap <br /> wrap method, blankets with both edges exposed -1-(76 mm) 3'(76 mm, <br /> alternate with blankets with covered edges, as 1-1/2"(36 mm> 2 1 3 1-,/2"(36 mm) <br /> shown in Figure 1 B. The visible edges of the <br /> perimeter overlaps alternate their directions and <br /> appear on every other blanket. <br /> 1. One Layer 3MTm Fire Barrier Duct Wrap 615+ 21'(53.3 gym)Typ. <br /> 1 <br /> 2. Steel Banding 1/2 in. (13 mm) Wide Min. Typical <br /> 3. 3 in. (76 mm) Min. Longitudinal Overlap <br /> 4 <br />