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[{"$nulls":28},"680/6880-20 H or V, 5680,56880-20 H or V Supply Grille"]
[{"$nulls":8},"Input Data",{"$nulls":12},"Nominal Duct","Core Area","H & W",null,null," "," "]
[null,"Enter Duct Width in inches =",{"$nulls":6},18,"Inches",{"$nulls":11},"Area '( ft2 )","( ft2 )","border",null,null," Free area & Core Area Ratio",null,"Ak/Ac",1,null,null," - ",null,"based on","KECdata"]
[null,"Enter Duct Height in inches =",{"$nulls":6},18,"Inches",{"$nulls":11},2.25,2.06640625,0.75]
[null,"Enter Minimum Air Flow (must be greater than 0)=",{"$nulls":6},1188,"CFM"]
[null,"Enter Maximum Air Flow =",{"$nulls":6},2893,"CFM",{"$nulls":16},"Throw Zones"]
[{"$nulls":26},"Blade angle","c(ii)","c(iii)","c(iv)"]
[{"$nulls":26},0,2.1907862171648422,6.688057526849242,17.30413919808573]
[null,"680/6880-20 H or V, 5680/56880-20 H or V Supply Grille",{"$nulls":24},15,1.7692756480075045,5.766403120735049,15.661279849986391]
[null,null,null,"IP Data",{"$nulls":22},30,1.4008479535092442,4.971758214897968,14.171130584432735,{"$nulls":4},"Kselect type",{"$nulls":4},"KEC Constants"]
[null,"Nom","Duct ","Neck","Air","0°",null,"15°",null,"30°",{"$nulls":25},"c(ii)","c(iii)","c(iv)",null,"Slope"," 0Const","15 const","30 const"]
[null,"Duct","Area","Vel","Flow","Pt","Throw","Pt","Throw","Pt","Throw","Nc","Octave Band, dB",{"$nulls":21},"0 deg",2.1907862171648422,6.688057526849242,17.30413919808573,null,-0.0018257,1.3014,1.2740144999999998,1.246629]
[null,"in","ft²","FPM","CFM","\"WG","ft","\"WG","ft","\"WG","ft",null,2,3,4,5,6,7,{"$nulls":8},"Pressure Constants from KEC",null,null,null," ",null,null,null,"15 deg",1.7692756480075045,5.766403120735049,15.661279849986391,null,-0.0014967,1.6512,1.6287495,1.606299]
[null,null,null,574.9111531190927,1188,0.04561215108934002,"37 - 55 - 84",0.057180450278665376,"32 - 48 - 76",0.07866443448741248,"27 - 41 - 69",11.859005271027337,33.091357917196945,30.800320882367146,27.9060051391138,21.26161321225402,14.136422753237923," - ",{"$nulls":8},"Blade angle","m","b",null," "," ",null,null,"30 deg",1.4008479535092442,4.971758214897968,14.171130584432735,null,-0.004293,0.8253,0.760905,0.6965100000000001]
[null,null,null,678.0491493383743,1401.125,0.06344558955075202,"43 - 65 - 92",0.07953686226289926,"37 - 56 - 83",0.10942065444260131,"32 - 48 - 75",16.78852704370632,37.47052749894448,35.07844924156086,32.5997640591672,26.743636989110286,20.550032269952112," - ",{"$nulls":8},0,0,2.2135234500000003]
[null,null,null,781.187145557656,1614.25,0.08421496318106354,"50 - 70 - 98",0.10557383065452167,"43 - 63 - 89",0.14524029881951536,"37 - 56 - 81",21.018693312452907,41.22842051657935,38.74963584199946,36.62761535445577,31.447921326355726,26.05373747496475,13.223303791230649,{"$nulls":8},15,0,2.7749243249999997]
[null,18,null,884.3251417769376,1827.375,0.10792027198027453,"57 - 74 - 105",0.13529135545353252,"49 - 67 - 95",0.18612336761815457,"42 - 61 - 86",24.723508364954792,44.5196146997221,41.964891818658316,40.15524125849521,35.567972954737655,30.873928595751465,18.083887575040706,{"$nulls":8},30,0,3.81752595]
[null,"x",2.25,987.4631379962193,2040.5,0.134561515948385,"63 - 78 - 111",0.16868943665993189,"55 - 71 - 100",0.23206986083851902,"47 - 64 - 91",28.019162971773792,47.447328800939005,44.825054342674804,43.293275518513326,39.233005334758815,35.16177693577623,22.407667605065683,{"$nulls":14},"KEC Constants"]
[null,18,null,1090.601134215501,2253.625,0.1641386950853949,"67 - 82 - 116",0.20576807427371963,"60 - 74 - 105",0.28307977848060856,"52 - 67 - 95",30.9871111420189,50.08392296700495,47.400813984536,46.11927646561398,42.53360186076185,39.02325914593666,26.30150860469672,{"$nulls":8},"Sound","titus const adgusted to agree with TEC octave bands!",{"$nulls":5},"2","3","4","5","6","7","NC"]
[null,null,null,1193.7391304347825,2466.75,0.19665180939130436,"70 - 86 - 122",0.246527268294896,"64 - 78 - 110",0.3391531205444234,"57 - 70 - 100",33.68667048463259,52.482092343762105,49.74365004724919,48.689724742125065,45.535728473786264,42.53555106574953,29.84323313836279,{"$nulls":10},"B","CVn","CAn",null,"M(An)",0.103,0.103,0.073,0.095,0.1095,0.167]
[null,null,null,1296.8771266540643,2679.875,0.2321008588661133,"73 - 90 - 127",0.2909670187234608,"66 - 81 - 115",0.40028988702996343,"60 - 73 - 104",36.16238133880545,54.68140460278963,51.89221725169921,51.04703046895048,48.28891760511672,45.7566024024041,33.09127652532453,{"$nulls":8},"0 deg",null,-181,68.79,9.6,null,"M(Vn)",61.11,59.7,65.5,76.5,89.5,90.25]
[null,null,null,1400.015122873346,2893,0.27048584350982174,"76 - 93 - 132",0.3390873255594141,"69 - 84 - 119",0.4664900779372287,"62 - 76 - 108",38.44854106969051,56.71232800959854,53.87628086463479,53.22385068079774,50.831310676968855,48.73103612698924,36.090635672182714,{"$nulls":14},"B",-138.7,-137.1,-156,-193,-236,-251]
[]
[null,"1) Performance data does not include damper",{"$nulls":24}," ",{"$nulls":12},"Band","Slope 1","Slope 2","Const"]
[null,"2) Data were obtained from test conducted in accordance with ANSI / ASHRAE Standard 70-1991.",{"$nulls":37},2,61.11,0.103,-138.7]
[null,"3) All pressures are in inches or water",{"$nulls":37},3,59.7,0.095,-137.1]
[null,"4) Throw values are given for terminal velocities of 150, 100, and 50 fpm, Isothermal Conditions",{"$nulls":34}," ",null,null,4,65.5,0.073,-156]
[null,"5) N.C. values are based on Octave Band 2 - 7 sound power levels minus a room absorption of 10dB.",{"$nulls":37},5,76.5,0.095,-193]
[null,"Sound data is based on 0 deg blade deflection. A setting of 15° and 30° increase sound by ",{"$nulls":24}," "," ",{"$nulls":11},6,89.5,0.1095,-236]
[null,"3 or 6 dB/NC respectively.  Dash (-) in space denotes an NC or dB value of less than 10.",{"$nulls":37},7,90.25,0.167,-251]
[null,"6) When selecting larger supply grilles for cooling purposes, account for drop by referring to the "]
[null,"Engineering Guidelines"]
[]
[null,"680/6880-20 H or V, 5680/56880-20 H or V Supply Grille"]
[null,null,null,"Metric Data"]
[null,"Nom","Duct ","Neck","Air","0°",null,"15°",null,"30°"]
[null,"Duct","Area","Vel","Flow","Pt","Throw","Pt","Throw","Pt","Throw","Nc","Octave Band, dB"]
[null,"mm","m²","m/s","L/s","Pa","m","Pa","m","Pa","m",null,2,3,4,5,6,7]
[null,null,null,2.920548657844991,560.6735112,11.357425621245664,"11.2 - 16.8 - 25.6",14.237932119387679,"9.7 - 14.5 - 23.2",19.58744418736571,"8.3 - 12.5 - 21.0",11.859005271027337,33.091357917196945,30.800320882367146,27.9060051391138,21.26161321225402,14.136422753237923," - "]
[null,null,null,3.4444896786389414,661.257300825,15.797951798137253,"13.2 - 19.7 - 27.8",19.804678703461914,"11.4 - 17.1 - 25.2",27.245742956207724,"9.8 - 14.7 - 22.8",16.78852704370632,37.47052749894448,35.07844924156086,32.5997640591672,26.743636989110286,20.550032269952112," - "]
[null,null,null,3.9684306994328926,761.84109045,20.969525832084823,"15.2 - 21.1 - 29.9",26.287883832975893,"13.1 - 19.1 - 27.1",36.16483440605933,"11.3 - 17.0 - 24.5",21.018693312452907,41.22842051657935,38.74963584199946,36.62761535445577,31.447921326355726,26.05373747496475,13.223303791230649]
[null,457.2,null,4.492371720226843,862.424880075,26.872147723088357,"17.2 - 22.5 - 31.8",33.687547507929594,"14.9 - 20.4 - 28.8",46.34471853692049,"12.8 - 18.4 - 26.0",24.723508364954792,44.5196146997221,41.964891818658316,40.15524125849521,35.567972954737655,30.873928595751465,18.083887575040706]
[null,"x",0.20903184000000002,5.016312741020794,963.0086697,33.505817471147864,"19.2 - 23.8 - 33.6",42.00366972832304,"16.6 - 21.5 - 30.4",57.78539534879123,"14.3 - 19.5 - 27.5",28.019162971773792,47.447328800939005,44.825054342674804,43.293275518513326,39.233005334758815,35.16177693577623,22.407667605065683]
[null,457.2,null,5.540253761814745,1063.592459325,40.87053507626333,"20.4 - 25.0 - 35.3",51.23625049415619,"18.3 - 22.6 - 32.0",70.48686484167153,"15.8 - 20.5 - 28.9",30.9871111420189,50.08392296700495,47.400813984536,46.11927646561398,42.53360186076185,39.02325914593666,26.30150860469672]
[null,null,null,6.064194782608696,1164.17624895,48.96630053843479,"21.3 - 26.1 - 36.9",61.3852898054291,"19.3 - 23.6 - 33.4",84.44912701556143,"17.3 - 21.4 - 30.3",33.68667048463259,52.482092343762105,49.74365004724919,48.689724742125065,45.535728473786264,42.53555106574953,29.84323313836279]
[null,null,null,6.588135803402647,1264.760038575,57.79311385766221,"22.2 - 27.2 - 38.5",72.45078766214175,"20.1 - 24.6 - 34.9",99.67218187046089,"18.2 - 22.3 - 31.5",36.16238133880545,54.68140460278963,51.89221725169921,51.04703046895048,48.28891760511672,45.7566024024041,33.09127652532453]
[null,null,null,7.112076824196598,1365.3438282,67.35097503394562,"23.1 - 28.3 - 40.0",84.43274406429411,"20.9 - 25.6 - 36.2",116.15602940636994,"18.9 - 23.2 - 32.8",38.44854106969051,56.71232800959854,53.87628086463479,53.22385068079774,50.831310676968855,48.73103612698924,36.090635672182714]
[]
[null,"1) Performance data does not include damper"]
[null,"2) Data were obtained from test conducted in accordance with ANSI / ASHRAE Standard 70-1991."]
[null,"3) All pressures are in inches or water"]
[null,"4) Throw values are given for terminal velocities of  0.75,0.5 and 0.25 m/s, Isothermal Conditions"]
[null,"5) N.C. values are based on Octave Band 2 - 7 sound power levels minus a room absorption of 10dB."]
[null,"Sound data is based on 0 deg blade deflection. A setting of 15° and 30° increase sound by "]
[null,"3 or 6 dB/NC respectively.  Dash (-) in space denotes an NC or dB value of less than 10."]
[null,"6) When selecting larger supply grilles for cooling purposes, account for drop by referring to the "]
[null,"Engineering Guidelines"]