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• <br /> • <br /> • <br /> • <br /> (a) This system is utilized when a cross-over duct has not been built into the floor, and the <br /> furnace is outside the I-beam.With this type of installation,it is necessary for two <br /> • flexible ducts to be installed. <br /> • <br /> Furnace "Vee' <br /> / - l> <br /> E_ • <br /> • �— �; Strap <br /> 10-Inch diameter flexible <br /> support Duct <br /> insulated duct with 1.0 perm. Block <br /> maximum vapor barrier --� support <br /> Flexible duct shall not-be in • • • <br /> contact with the ground <br /> • <br /> • <br /> • <br /> (b)- This system is used when a cross-over duct has not been built into the floor, and the <br /> furnace is situated directly over the main duct in one section of the home. A single <br /> flexible duet is then used to connect the two sections to each other, <br /> • <br /> r-11- Furnace • <br /> f <br /> • <br /> Strap <br /> support <br /> \ Duct <br /> 10-inch diameter flexible �� Block <br /> insulated duct with 1.0 perm { upporf <br /> maximum vapor barrier • I <br /> Flexible duct shall not be in - <br /> contact with the ground • <br /> • <br /> Figure 5-1 --Cross-over duct Installation <br />