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[{"$nulls":28},"S80P / S580P Perforated Face Return "]
[{"$nulls":8},"Input Data",{"$nulls":12},"Nominal Duct","Core Area","H & W",null,null," "," "]
[null,"Enter Duct Width in inches =",{"$nulls":6},20,"Inches",{"$nulls":11},"Area ( ft2 )","( ft2 )","border",null,null," Free area & Core Area Ratio",null,"Ak/Ac",1,null,null," - ",null,"Based on 6790 perforated constants"]
[null,"Enter Duct Height in inches =",{"$nulls":6},20,"Inches",{"$nulls":11},2.7777777777777777,2.5733506944444446,0.75]
[null,"Enter Air Flow (must be greater than 0) =",{"$nulls":6},1000,"CFM"]
[null,"Series =","S80P",{"$nulls":4},"Tag =","Room 23"]
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[null,"S80P Return Grille",{"$nulls":25},"m","b",null," "," "]
[null,"Tag : Room 23",{"$nulls":24},"0 Degrees",0,5.1]
[null,"IP Data",{"$nulls":5},"Metric Data"]
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[null,"Duct","Area","Vel","Flow","Ps","Nc","Duct","Area","Vel","Flow","Ps","Octave Band, dB",{"$nulls":20},"2","3","4","5","6","7"]
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