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� � t�AN�E Gt�ARD� <br />The Wet Chemical System <br />Designi�g for Duct Protection <br />ADP Noale <br />Two ADP noules {P1N 96981) shall be used in ducts with <br />a perimeter up to 75 inches or 23.8 inches maximum diameter. <br />The ratio of the longest to shortest perimeter sides shall not <br />exceed 3 to 1. One af these noules is pointed into the duct and <br />the other is pointed into the olenum. Each ADP noule (PM <br />96981) has a flow number of 1. <br />The tip of the upper nozzle, of the pair of noales required <br />for each duct, shall be positianed in the center of lhe duct <br />opening and above the plane of the hood-tuct opening be- <br />hveen 1' and 24". The duct length is unlimited. <br />When the,duct perirneter exceeds 75", divide the duct area <br />with imaginary walls so that the smaller ducts created have a <br />perimeter of 75" or less, includingthe lengths of ihe imaginary <br />DUCT NOZZLE PLA <br />D-1 i <br />walls. Place a pair oi no.zzles (P/N 96981) in the center of each <br />otthe imagirary ducts, one nozzle pointed into Ihe duM and the <br />other pointed in the opposi!e direstion. <br />Ducts 25 feet or less in length and with a perimeter o: 48' <br />or less (or 1b-1/4' diameter) may be protected with one ADP <br />noale pointed up into the du�t. The tip oi the no�le shali be <br />positioned in Ihe center of the duct opening and al�ove the <br />plane ot the haod-duct opening between 1" to 24'. <br />Afterplacing your ADP nozzle(s) in the duct(s), detertnine <br />the total flow r.;;mbers necessary to protect the duct(s). <br />NOTE: W'-�CN A DAMPER IS PRESENi AT THE HOOD <br />DUC7'JPENING THE DUCT NOZZLES ARE TO BE LO- <br />CATI_D ABOVE THE DAMPER AND SHOULD NOT INTEH- <br />FERE V1'ITH THE OPERATION OF THE DAMPEH. <br />DUCT PERIMETER EXCEEDS 75" <br />PERIMETER TO LARGE FOR ONE PAIR OF <br />ADP NOZZLES. <br />20' <br />PERIMETER - 20'+30'+20'�30' <br />PERIMETER=100' <br />1 30• � <br />U.L EX 2a58 <br />FiGURE 18d <br />SUBDIVIDED DUCT INTO TWO IMAGINARY SMALLER <br />DUCTS. THE SMALLER DUCTS PERIMETER ARE LESS <br />THAN 75' AND REOUIRE THE USE OF A PAIR OF ADP <br />NOZZLES IN EACH. <br />ONE PAIR OF ADP <br />� NOr1LES PER DUCT <br />15, PERIMETER_20'+15'�20'+15' <br />PERIMETER-70' PER IMAGINARY <br />SMAL�CT <br />�� <br />07988, 1990 Fggie Intemational, Ine., PJI righb reservad (71194) <br />