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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},22,"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},22,"Inches",{"$nulls":11},3.361111111111111,3.1358506944444446,0.75]
[null,"Enter Minimum Neck Velocity (greater than 0)=",{"$nulls":6},550,"FPM"]
[null,"Enter Maximum Neck Velocity =",{"$nulls":6},1400,"FPM",{"$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,{"$nulls":8},"Pressure Constants from KEC",null,null,null," ",null,null,null,"15 deg",1.7692756480075045,5.766403120735049,15.661279849986391,null,-0.0014967,1.6512,1.6287495,1.606299]
[null,null,null,550,1724.7178819444446,0.04174500000000001,"43 - 65 - 102",0.0523325,"37 - 56 - 92",0.071995,"32 - 48 - 83",12.27456102641218,33.72711772176734,31.46320632958046,28.457309928647078,21.601299513083745,14.226014476508906," - ",{"$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,656.25,2057.902018229167,0.05943164062500002,"52 - 78 - 111",0.0745048828125,"45 - 67 - 100",0.10249804687500001,"39 - 58 - 91",17.551209892223135,38.414659692834476,36.04259195669073,33.48159399189197,27.469356472446123,21.091257585828288," - ",{"$nulls":8},0,0,2.2135234500000003]
[null,null,null,762.5,2391.086154513889,0.08023406250000001,"60 - 85 - 120",0.10058328124999999,"52 - 77 - 108",0.13837468749999998,"45 - 67 - 98",22.034290761318026,42.397230879204415,39.933272693497884,37.750263812007034,32.4549021402141,26.924020164458796,14.085700050472893,{"$nulls":8},15,0,2.7749243249999997]
[null,22,null,868.75,2724.2702907986113,0.10415226562500002,"69 - 90 - 128",0.1305676953125,"59 - 82 - 116",0.179624921875,"51 - 74 - 105",25.931586118681302,45.85941607019831,43.315574377384905,41.46116431945427,36.78900731303415,31.994639941810362,19.198811055009003,{"$nulls":8},30,0,3.81752595]
[null,"x",3.361111111111111,975,3057.4544270833335,0.13118625000000003,"77 - 96 - 135",0.164458125,"66 - 87 - 122",0.22624875000000003,"57 - 78 - 111",29.378639130005517,48.921625832111715,46.307129323976795,44.743356095028275,40.622406867712186,36.47946687179319,23.72122033356709,{"$nulls":14},"KEC Constants"]
[null,22,null,1081.25,3390.6385633680557,0.161336015625,"82 - 101 - 142",0.20225457031249996,"74 - 91 - 129",0.27824617187499995,"63 - 83 - 117",32.46878944343194,51.66677898887124,48.98894315900449,47.68571465774713,44.0589019829487,40.499941549096036,27.77538613945069,{"$nulls":8},"Sound","titus const adgusted to agree with TEC octave bands!",{"$nulls":5},"2","3","4","5","6","7","NC"]
[null,null,null,1187.5,3723.822699652778,0.19460156250000005,"86 - 106 - 149",0.24395703125,"78 - 96 - 135",0.3356171875,"70 - 86 - 122",35.2690582187472,54.15441418089793,51.41918077909932,50.35205576522134,47.1730255664873,44.14326260434706,31.44923781806972,{"$nulls":10},"B","CVn","CAn",null,"M(An)",0.103,0.103,0.073,0.095,0.1095,0.167]
[null,null,null,1293.75,4057.0068359375005,0.23098289062500005,"90 - 110 - 156",0.28956550781249996,"81 - 100 - 141",0.398361796875,"74 - 90 - 128",37.82919807318347,56.428729437542785,53.64102042599339,52.78975253023913,50.02010652105005,47.474161237462965,34.80804900956372,{"$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,1400,4390.190972222223,0.27048000000000005,"94 - 115 - 162",0.33908000000000005,"85 - 104 - 147",0.46648000000000006,"77 - 94 - 133",40.18715919040917,58.52343802707125,55.68739749676496,55.034940103698716,52.64234849615934,50.54201295997643,37.901608986735084,{"$nulls":14},"B",-138.7,-137.1,-156,-193,-236,-251]
[]
[null,"1) Performance data does not include damper",{"$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,2.794,813.9761201171876,10.394505000000002,"13.2 - 19.8 - 30.9",13.030792499999999,"11.4 - 17.1 - 28.0",17.926755,"9.8 - 14.7 - 25.3",12.27456102641218,33.72711772176734,31.46320632958046,28.457309928647078,21.601299513083745,14.226014476508906," - "]
[null,null,null,3.33375,971.221506958008,14.798478515625005,"15.8 - 23.6 - 33.7",18.551715820312502,"13.6 - 20.4 - 30.5",25.522013671875005,"11.7 - 17.6 - 27.6",17.551209892223135,38.414659692834476,36.04259195669073,33.48159399189197,27.469356472446123,21.091257585828288," - "]
[null,null,null,3.8735000000000004,1128.4668937988283,19.9782815625,"18.3 - 25.7 - 36.4",25.045237031249997,"15.8 - 23.3 - 32.9",34.455297187499994,"13.6 - 20.4 - 29.8",22.034290761318026,42.397230879204415,39.933272693497884,37.750263812007034,32.4549021402141,26.924020164458796,14.085700050472893]
[null,558.8,null,4.413250000000001,1285.7122806396485,25.933914140625003,"20.9 - 27.5 - 38.8",32.5113561328125,"18.0 - 24.8 - 35.1",44.726605546875,"15.5 - 22.5 - 31.8",25.931586118681302,45.85941607019831,43.315574377384905,41.46116431945427,36.78900731303415,31.994639941810362,19.198811055009003]
[null,"x",0.31225744000000005,4.953,1442.957667480469,32.66537625000001,"23.4 - 29.1 - 41.1",40.950073125,"20.2 - 26.3 - 37.2",56.335938750000004,"17.4 - 23.8 - 33.7",29.378639130005517,48.921625832111715,46.307129323976795,44.743356095028275,40.622406867712186,36.47946687179319,23.72122033356709]
[null,558.8,null,5.49275,1600.203054321289,40.172667890625,"25.0 - 30.6 - 43.3",50.361388007812494,"22.4 - 27.7 - 39.2",69.28329679687499,"19.3 - 25.1 - 35.5",32.46878944343194,51.66677898887124,48.98894315900449,47.68571465774713,44.0589019829487,40.499941549096036,27.77538613945069]
[null,null,null,6.032500000000001,1757.4484411621095,48.45578906250001,"26.2 - 32.1 - 45.4",60.74530078125,"23.7 - 29.1 - 41.1",83.56867968750001,"21.2 - 26.3 - 37.2",35.2690582187472,54.15441418089793,51.41918077909932,50.35205576522134,47.1730255664873,44.14326260434706,31.44923781806972]
[null,null,null,6.57225,1914.6938280029299,57.51473976562501,"27.4 - 33.5 - 47.4",72.10181144531249,"24.8 - 30.3 - 42.9",99.192087421875,"22.4 - 27.4 - 38.8",37.82919807318347,56.428729437542785,53.64102042599339,52.78975253023913,50.02010652105005,47.474161237462965,34.80804900956372]
[null,null,null,7.112,2071.93921484375,67.34952000000001,"28.5 - 34.9 - 49.3",84.43092000000001,"25.8 - 31.5 - 44.6",116.15352000000001,"23.3 - 28.5 - 40.4",40.18715919040917,58.52343802707125,55.68739749676496,55.034940103698716,52.64234849615934,50.54201295997643,37.901608986735084]
[]
[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"]