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r � r: � <br /> System Design <br /> 3-6.1.1.4 Upper/Lower Plenum Examples <br /> Protection of special or unique plenum arrangements should be reviewed by the AHJ (Authority <br /> Having Jurisdiction). Badger recommends that upper/lower plenum arrangements be protected as <br /> shown below. <br /> Note: All Range Guard systems are listed by UL and ULC for use with the exhaust fan either on or <br /> off when the system is discharged. <br /> 1. If risers are less than 6 in. (152 mm), nozzles are required to protect the upper and lower <br /> plenums and in the main exhaust duct. (See Figure 3-33 and Figure 3-34). <br /> Example 1 —Riser less than 6 in. (152 mm) in Length <br /> ADP NOZZLES <br /> 1 <br /> � <br /> RISER <br /> —� <br /> � <br /> r1 10ft.(3m) -I <br /> Figure 3-33. Special Plenum Arrangements <br /> 2. If risers are 6 in. (152 mm) or longer, the risers become the e�aust ducts and there is no upper <br /> plenum. Nozzle(s)are required in the lower plenum and also in each such riser. The riser portion <br /> is to be treated now as the hood duct opening and protected accordingly. (See Figure 3-34). <br /> Example 2 —Riser more than 6 in. (152 mm) in Length <br /> T <br /> 1 1 t -� <br /> � <br /> Figure 3-34. Special Plenum Arrangements With 6 in. (152 mm) Risers <br /> �� <br /> P/N 60-9127100-000 3-39 April 2009 <br />