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The Krueger 1240/51240 series modular core diffusers are one of Krueger's most quiet and versatile diffusers, combining excellent performance with on-the- ...
DIFFUSERS | MODULAR CORE
INTRODUCTION
The Krueger 1240/51240 series modular core diffusers are one of Krueger's most quiet and versatile diffusers, combining excellent performance with on-the-job flexibility. The 1240/51240 series diffusers exhibit typical isothermal throws of 20' to 30' for 4-way air distribution and 40' to 60' for 1-way air distribution. The modular cores in the neck maintain a tight horizontal air pattern at the ceiling from maximum to minimum CFM, making this series an excellent selection for variable air volume applications. The modular cores are factory set for a four-way air pattern, but may be field adjusted for 1-, 2- or 3-way air patterns. The modular capability makes the 1240/51240 ideal for installations with changing air pattern requirements such as tenant lease spaces.
MODELS
1240 - Modular Core Diffuser, Steel Construction 51240 - Modular Core Diffuser, Aluminum Construction
FEATURES
· Hand-removable modular cores. · Variety of discharge air patterns. · Air diffused through fixed vanes.
PANEL SIZE
· 24"x24"
ACCESSORIES
· Optional Damper (Model OBD1240, 5OBD1240) · Optional Straightening Grid (Model SSG)
FINISHES
· Standard finish is #44 British White. · Optional finishes available.
1240, 51240 SERIES
Diffuser | Modular Core
1240
The area encircled represents one core. Each core represents one quarter section of the diffuser. EXAMPLE: Two core throw will show two of the four cores facing in the same direction. Three core throw will show three of the four cores facing in the same direction. Reference page D1-6 for discharge air patterns.
© Copyright Krueger 2024
D1-3
DIFFUSERS | MODULAR CORE
1240, 51240 SERIES
Diffuser | Modular Core
DIMENSIONAL DATA
MMININIMIMUUMMCCEIELIILNINGGOOPPENENININGG NNOOMMININALALDDUUCCTTSISZIEZE++1"1"(2(255) )
DDUUCCTTSISZIEZE- -1/14/4""(6(6) )
221/18/8""(5(544) ) 151/51/61"6("2(42)4)
DDUUCCT TSISZIEZE+ +55""(1(2127)7)
F2F211 SSUURRFAFACCEEMMOOUUNNTT- -BBEVEVELEELDED
MMININIMIMUUMMCCEIELIILNINGGOOPPENENININGG DDUUCCTTSISZIEZE++3"3"(6(644) )
DDUUCCTTSISZIEZE- -1/14/4""(6(6) )
221/18/8""(5(544) )
1/14/4""(6(6) )
DDUUCCT TSISZIEZE+ +5599/1/616""(1(4141)1)
F2F22 SSUURRFAFACCEEMMOOUUNNTT- -FLFALATT
DDUUCCTTSISZIEZE- -1/14/4""(6(6) )
223/31/616""(5(566) )
3/38/8""(1(010) )
22333/34/4""(6(6003)3) F2F233 LALAYY-I-NINT-TB-BAARR
DDUUCCTTSISZIEZE- -1/14/4""(6(6) )
223/31/616""(5(566) )
3/38/8""(1(010) )
2233313/13/232""(6(60099) )
F2F299 CCAAMMLOLOCCKK
223/31/616""(5(566) ) 223/31/616""(5(566) )
DDUUCCTTSISZIEZE- -1/14/4""(6(6) )
3/38/8""(1(010) )
2227/78/8""(5(5881)1) 22333/34/4""(6(6003)3) F3F300 DDRROOPPFAFACCEE
DDUUCCTTSISZIEZE- -1/14/4""(6(6) )
55/1/616""(8(8) )
2233131/33/232""(5(59955) ) 22332255/3/232""(6(60044) ) F9F988 NNAARRROOWW-T-T
DDUUCCT TSISZIEZE
OO.A..AB. BASAESEUUNNITITHHEIEGIGHHTT
DDAAMMPPERERDDETEATAILIL
OO.A..AB. BASAESE UUNNITITHHEIEGIGHHT T ++113/34/4""(4(44) )
AVAILABLE NECK SIZES
FRAME STYLE
NECK SIZE
SURFACE MOUNT
24" X 24" LAY-IN PANEL
F21 F22 F23 F29 F30 F98
6" x 6" (152 x 152)
·
·
·
·
·
·
8" x 8" (203 x 203)
·
·
·
·
·
·
10" x 10" (254 x 254) ·
·
·
·
·
·
12" x 12" (305 x 305) ·
·
·
·
·
·
14" x 14" (356 x 356) ·
·
·
·
·
·
16" x 16" (406 x 406) ·
·
·
·
·
·
18" x 18" (457 x 457)
·
·
·
·
·
·
20" x 20" (508 x 508) ·
·
·
22" x 22" (559 x 559) ·
·
24" x 24" (610 x 610)
·
·
NOTES: Dimensions in parentheses are mm. Dot indicates available neck sizes.
D1-4
© Copyright Krueger 2024
DIFFUSERS | MODULAR CORE
DIMENSIONAL DATA
SPRING CLIP PART NUMBER: 004717
1240, 51240 SERIES
Diffuser | Modular Core
To remove core, apply pressure towards the spring clip. When it has compressed completely, lift notched end of core away from frame rail.
NECK SIZE
CORE WIDTH
NO. OF BLADES
PART NUMBER
6" x 6" (152 x 152) 8" x 8" (203 x 203) 10" x 10" (254 x 254) 12" x 12" (305 x 305) 14" x 14" (356 x 356) 16" x 16" (406 x 406) 18" x 18" (457 x 457) 20" x 20" (508 x 508) 22" x 22" (559 x 559) 24" x 24" (610 x 610)
2.75" 3.75" 4.75" 5.75" 6.75" 7.75" 8.75" 9.75" 10.75" 11.75"
3
0989800606
4
0989800808
5
0989801010
6
0989801212
7
0989801414
8
0989801616
9
0989801818
10
0989802020
11
0989802222
12
0989802424
NOTE: Listed core assembly part numbers work on 1240, 1240P, and 1240PE series.
DISCHARGE AIR PATTERNS
1 CORE THROW (4-WAY THROW)
2 CORE THROW (2 OR 3-WAY THROW)
3 CORE THROW (2-WAY THROW)
4 CORE THROW (1-WAY THROW)
NOTE: Reference page D1-3 for core detail.
© Copyright Krueger 2024
D1-5
DIFFUSERS | MODULAR CORE
Airflow (CFM)
1240, 51240 SERIES
Diffuser | Modular Core
SOUND CHART | NO DAMPER
AIRFLOW VS. NC (NO DAMPER)
4000
3600
3200
2800
2400
2000
1600
1200
800
400
0
15
20
Airflow vs NC Level1240
25
30
35
Sound Level, NC
Neck Size 24" x 24" 22" x 22" 20" x 20" 18" x 18" 16" x 16" 14" x 14" 12" x 12" 10" x 10" 8" x 8" 6" x 6"
40
D1-6
© Copyright Krueger 2024
DIFFUSERS | MODULAR CORE
1240, 51240 SERIES
Diffuser | Modular Core
ADPI CHARTS | NO DAMPER
Spacing for 80% ADPI 1240, 8x8in inlet, 4 way
DIFFUSER SPACING FOR 80% ADPI: 8"x8" NECK, 4-WAY (NO DAMPER)
24
1/2 Unit Separation Distance, L
20 NC=34
16
12
8
CFM 489 400 311 222 133
4
0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 CFM/Sq.Ft. Spac1in2g40fo, r1840x%14AinDiPnIlet, 4 way
DIFFUSER SPACING FOR 80% ADPI: 14"x14" NECK, 4-WAY (NO DAMPER)
36
32
1/2 Unit Separation Distance, L
28 NC=35
24 20 16 12
CFM 1089 817 681 544 408
8
4
0.0
0.3
0.5
0.8
1.0
1.3
1.5
1.8
2.0
2.3
2.5
CFM/Sq.Ft.
NOTES: Charts are at 20 BTUH/ft2 loads. See the Engineering section of this catalog for instructions on how to read these charts and additional ADPI information.
© Copyright Krueger 2024
D1-7
DIFFUSERS | MODULAR CORE
1240, 51240 SERIES
Diffuser | Modular Core
PERFORMANCE DATA | 1-CORE, NO DAMPER
NECK SIZE
6" x 6"
8" x 8"
10" x 10"
12" x 12"
14" x 14"
NECK VEL
FPM 300 400 500 600 700 800 900 1000 1100 300 400 500 600 700 800 900 1000 1100 300 400 500 600 700 800 900 1000 1100 300 400 500 600 700 750 800 900 1000 300 400 500 600 700 750 800 900 1000
AIR FLOW
CFM 75 100 125 150 175 200 225 250 275 133 178 222 267 311 356 400 444 489 208 278 347 417 486 556 625 694 764 300 400 500 600 700 750 800 900 1000 408 544 681 817 953 1021 1089 1225 1361
IP DATA
Ps
Pt
"WG 0.005 0.009 0.014 0.021 0.028 0.037 0.047 0.058 0.070 0.008 0.013 0.021 0.030 0.041 0.053 0.068 0.084 0.101 0.011 0.019 0.029 0.042 0.057 0.075 0.095 0.117 0.142 0.014 0.025 0.039 0.057 0.077 0.089 0.101 0.128 0.158 0.019 0.033 0.052 0.074 0.101 0.116 0.132 0.167 0.206
"WG 0.011 0.019 0.030 0.043 0.059 0.077 0.097 0.120 0.145 0.013 0.023 0.036 0.053 0.071 0.093 0.118 0.146 0.177 0.016 0.029 0.045 0.065 0.088 0.115 0.145 0.179 0.217 0.020 0.035 0.055 0.079 0.108 0.124 0.141 0.178 0.220 0.024 0.043 0.067 0.097 0.132 0.151 0.172 0.217 0.268
1-CORE THROW
ft 3-6-8 5-6-9 6-7-10 6-8-11 7-8-12 7-9-13 8-10-14 8-10-14 9-11-15 4-7-10 7-9-12 8-10-13 9-10-15 9-11-16 10-12-17 10-13-18 11-13-19 12-14-20 5-9-13 9-11-15 10-12-17 11-13-18 12-14-20 12-15-21 13-16-23 14-17-24 14-18-25 6-11-16 10-13-18 12-14-20 13-16-22 14-17-24 14-18-25 15-18-26 16-19-27 17-20-29 7-13-18 12-15-21 14-17-24 15-18-26 16-20-28 17-20-29 17-21-30 18-22-32 19-24-33
METRIC DATA
NC
NECK AIR VEL FLOW
Ps
Pt
m/s L/s
Pa
Pa
-
1.52
35
1.3
2.7
-
2.03
47
2.3
4.8
-
2.54
59
3.6
7.5
12
3.05
71
5.2
10.7
16
3.56
83
7.0
14.6
20
4.06
94
9.2
19.1
23
4.57 106
11.6
24.2
26
5.08 118
14.3
29.8
29
5.59 130
17.3
36.1
-
1.52
63
1.9
3.3
-
2.03 84
3.3
5.8
12
2.54 105
5.2
9.1
17
3.05 126
7.5
13.1
21
3.56 147
10.2
17.8
25
4.06 168
13.3
23.2
28
4.57 189
16.8
29.4
31
5.08 210
20.8
36.3
34
5.59 231
25.2
43.9
-
1.52
98
2.6
4.0
-
2.03 131
4.7
7.1
16
2.54 164
7.3
11.2
21
3.05 197
10.5
16.1
25
3.56 229
14.3
21.9
29
4.06 262
18.6
28.6
32
4.57 295
23.6
36.2
35
5.08 328
29.1
44.6
38
5.59 361
35.2
54.0
-
1.52 142
3.5
4.9
13
2.03 189
6.3
8.8
19
2.54 236
9.8
13.7
24
3.05 283
14.1
19.7
28
3.56 330
19.3
26.9
30
3.81 354
22.1
30.8
32
4.06 378
25.1
35.1
35
4.57 425
31.8
44.4
38
5.08 472
39.3
54.8
-
1.52 193
4.6
6.0
16
2.03 257
8.2
10.7
22
2.54 321
12.8
16.7
27
3.05 385
18.5
24.1
31
3.56 450
25.1
32.7
33
3.81 482
28.9
37.6
35
4.06 514
32.8
42.8
38
4.57 578
41.6
54.1
41
5.08 642
51.3
66.8
1-CORE THROW
m 1.0-1.7-2.4 1.6-1.9-2.7 1.8-2.2-3.1 1.9-2.4-3.4 2.1-2.6-3.6 2.2-2.7-3.9 2.4-2.9-4.1 2.5-3.1-4.3 2.6-3.2-4.6 1.3-2.2-3.2 2.1-2.6-3.7 2.4-2.9-4.1 2.6-3.2-4.5 2.8-3.4-4.8 3.0-3.7-5.2 3.2-3.9-5.5 3.3-4.1-5.8 3.5-4.3-6.1 1.6-2.8-4.0 2.6-3.2-4.6 3.0-3.6-5.1 3.2-4.0-5.6 3.5-4.3-6.1 3.7-4.6-6.5 4.0-4.9-6.9 4.2-5.1-7.2 4.4-5.4-7.6 1.9-3.4-4.8 3.2-3.9-5.5 3.5-4.3-6.1 3.9-4.8-6.7 4.2-5.1-7.3 4.3-5.3-7.5 4.5-5.5-7.8 4.8-5.8-8.2 5.0-6.1-8.7 2.3-3.9-5.6 3.7-4.5-6.4 4.1-5.1-7.2 4.5-5.6-7.9 4.9-6.0-8.5 5.1-6.2-8.8 5.2-6.4-9.1 5.6-6.8-9.6 5.9-7.2-10.1
OCTAVE BAND, dB
234567 23 20 12 - - 29 25 19 - - 32 29 24 13 - 36 33 29 19 14 38 35 32 24 20 11 41 38 36 29 25 17 43 40 38 32 29 23 45 42 41 36 33 28 46 43 43 39 36 32 26 24 16 - - 31 29 23 11 - 34 33 29 18 12 38 36 33 24 19 40 39 37 29 24 17 43 41 40 34 29 23 45 44 43 38 34 28 47 45 46 41 38 33 48 47 48 44 41 37 27 27 20 - - 32 32 27 15 - 36 36 32 22 16 39 39 37 28 22 14 42 42 41 33 28 21 44 44 44 38 33 27 46 46 47 42 38 33 48 48 49 45 41 37 50 50 52 48 45 42 28 29 23 - - 33 34 30 18 11 37 38 35 26 19 41 41 40 32 26 18 43 44 44 37 31 25 44 45 45 39 34 28 46 47 47 41 36 31 48 49 50 45 41 36 50 51 52 48 44 41 29 31 25 12 - 34 36 32 21 13 38 40 38 28 21 12 42 43 42 34 28 20 44 46 46 39 34 27 46 47 48 42 36 31 47 49 49 44 39 34 49 51 52 48 43 39 51 53 55 51 47 44
NOTES: Throw values are given for terminal velocities of 150, 100, and 50 FPM (0.75, 0.50, and 0.25 m/s). Throw values are given for isothermal conditions. NC values are based on octave band 2 - 7 sound power levels minus a room absorption of 10dB, re10-12 Watts. Dash in space denotes a NC or dB value of less than 10. Data was obtained from tests conducted in accordance with ANSI/ASHRAE Standard 70, ISO Standard 5219, and ISO Standard 3741. See Krueger's selection software for performance data not shown.
D1-8
© Copyright Krueger 2024
DIFFUSERS | MODULAR CORE
1240, 51240 SERIES
Diffuser | Modular Core
PERFORMANCE DATA | 1-CORE, NO DAMPER
NECK SIZE
16" x 16"
18" x 18"
20" x 20"
22" x 22"
24" x 24"
NECK VEL
FPM 300 400 500 600 700 750 800 900 1000 300 400 500 600 650 700 750 800 900 200 300 400 500 600 650 700 800 900 100 200 300 400 500 550 600 700 800 100 200 300 400 500 550 600 700 800
AIR FLOW
CFM 533 711 889 1067 1244 1333 1422 1600 1778 675 900 1125 1350 1463 1575 1688 1800 2025 556 833 1111 1389 1667 1806 1944 2222 2500 336 672 1008 1344 1681 1849 2017 2353 2689 400 800 1200 1600 2000 2200 2400 2800 3200
IP DATA
Ps "WG 0.024 0.042 0.065 0.094 0.128 0.147 0.168 0.212 0.262 0.029 0.052 0.081 0.117 0.137 0.159 0.183 0.208 0.263 0.016 0.036 0.063 0.099 0.142 0.167 0.194 0.253 0.320 0.005 0.019 0.043 0.076 0.118 0.143 0.170 0.232 0.303 0.006 0.022 0.050 0.089 0.140 0.169 0.201 0.274 0.358
Pt "WG 0.029 0.052 0.081 0.117 0.159 0.182 0.207 0.263 0.324 0.035 0.062 0.097 0.139 0.164 0.190 0.218 0.248 0.314 0.018 0.041 0.073 0.114 0.165 0.193 0.224 0.293 0.371 0.005 0.021 0.048 0.086 0.134 0.162 0.193 0.263 0.343 0.006 0.025 0.056 0.099 0.155 0.188 0.224 0.304 0.398
1-CORE THROW
ft 9-15-21 14-17-24 16-19-27 17-21-30 18-23-32 19-23-33 20-24-34 21-26-36 22-27-38 10-17-23 16-19-27 18-21-30 19-23-33 20-24-35 21-25-36 21-26-37 22-27-38 23-29-41 5-11-21 11-18-26 17-21-30 19-24-34 21-26-37 22-27-38 23-28-40 25-30-43 26-32-45 1-3-12 5-12-23 12-20-29 19-23-33 21-26-37 22-27-39 23-29-41 25-31-44 27-33-47 3-8-18 13-18-26 18-22-31 21-26-36 23-29-40 24-30-42 26-31-44 28-34-48 30-36-51
METRIC DATA
NC
NECK AIR VEL FLOW
Ps
Pt
1-CORE THROW
OCTAVE BAND, dB
m/s L/s
Pa
Pa
m
234567
-
1.52 252
5.9
7.3
2.6-4.5-6.3 30 33 28 14 - -
18
2.03 336
10.4
12.9
4.2-5.2-7.3 35 38 35 24 15 -
24
2.54 420
16.3
20.2
4.7-5.8-8.2 39 42 40 31 24 15
29
3.05 503
23.5
29.1
5.2-6.3-9.0 43 45 44 37 30 23
33
3.56 587
31.9
39.5
5.6-6.9-9.7 45 48 48 42 36 30
35
3.81 629
36.7
45.4
5.8-7.1-10.0 46 49 50 44 39 33
37
4.06 671
41.7
51.7
6.0-7.3-10.4 48 50 51 46 41 36
40
4.57 755
52.8
65.4
6.3-7.8-11.0 50 52 54 50 45 41
43
5.08 839
65.2
80.7
6.7-8.2-11.6 52 54 57 54 49 46
12
1.52 319
7.3
8.7
2.9-5.1-7.1 31 34 29 16 - -
20
2.03 425
12.9
15.4
4.7-5.8-8.2 36 39 36 26 17 -
26
2.54 531
20.2
24.1
5.3-6.5-9.2 40 43 42 33 26 17
31
3.05 637
29.1
34.7
5.8-7.1-10.1 43 47 46 39 32 25
33
3.30 690
34.2
40.7
6.1-7.4-10.5 45 48 48 42 35 29
35
3.56 743
39.6
47.2
6.3-7.7-10.9 46 49 50 44 38 32
37
3.81 796
45.5
54.2
6.5-8.0-11.3 47 51 52 46 41 35
39
4.06 850
51.8
61.7
6.7-8.2-11.7 48 52 53 48 43 38
42
4.57 956
65.5
78.1
7.1-8.7-12.4 51 54 56 52 47 44
-
1.02 262
3.9
4.6
1.4-3.2-6.5 25 28 21 - - -
14
1.52 393
8.9
10.3
3.2-5.6-7.9 32 36 31 18 - -
22
2.03 524
15.8
18.2
5.3-6.5-9.2 37 41 38 28 19 -
28
2.54 655
24.6
28.5
5.9-7.2-10.2 41 45 44 35 27 19
33
3.05 787
35.4
41.0
6.5-7.9-11.2 44 48 48 41 34 27
35
3.30 852
41.6
48.2
6.7-8.3-11.7 46 49 50 43 37 31
37
3.56 918
48.2
55.9
7.0-8.6-12.1 47 51 52 46 40 34
41
4.06 1049 63.0
73.0
7.5-9.2-13.0 49 53 55 50 45 40
44
4.57 1180 79.8
92.3
7.9-9.7-13.7 51 55 58 54 49 46
-
0.51 159
1.2
1.3
0.4-0.9-3.6 13 17 - - - -
-
1.02 317
4.7
5.3
1.6-3.6-7.1 25 30 23 - - -
15
1.52 476
10.6
12.0
3.6-6.2-8.7 33 37 33 20 - -
23
2.03 635
18.9
21.3
5.8-7.1-10.1 38 42 40 29 21 11
30
2.54 793
29.5
33.4
6.5-8.0-11.3 42 46 45 37 29 21
32
2.79 872
35.7
40.4
6.8-8.4-11.8 43 48 48 40 33 25
35
3.05 952
42.4
48.0
7.1-8.7-12.3 45 49 50 43 36 29
39
3.56 1110
57.8
65.4
7.7-9.4-13.3 47 52 53 48 42 36
43
4.06 1269 75.4
85.4 8.2-10.1-14.3 50 54 57 52 46 42
-
0.51 189
1.4
1.5
1.0-2.3-5.5 14 18 - - - -
-
1.02 378
5.6
6.2
4.1-5.5-7.8 26 31 24 - - -
17
1.52 566
12.5
13.9
5.5-6.7-9.5 33 38 34 21 12 -
25
2.03 755
22.3
24.7
6.3-7.8-11.0 38 43 41 31 22 12
31
2.54 944
34.8
38.7
7.1-8.7-12.3 42 47 47 38 31 22
34
2.79 1038 42.1
46.8
7.4-9.1-12.9 44 49 49 41 34 27
36
3.05 1133
50.1
55.7
7.8-9.5-13.5 45 50 51 44 37 31
41
3.56 1321 68.2
75.8 8.4-10.3-14.5 48 53 55 49 43 38
44
4.06 1510
89.1
99.0 9.0-11.0-15.6 50 55 58 54 48 44
NOTES: Throw values are given for terminal velocities of 150, 100, and 50 FPM (0.75, 0.50, and 0.25 m/s). Throw values are given for isothermal conditions. NC values are based on octave band 2 - 7 sound power levels minus a room absorption of 10dB, re10-12 Watts. Dash in space denotes a NC or dB value of less than 10. Data was obtained from tests conducted in accordance with ANSI/ASHRAE Standard 70, ISO Standard 5219, and ISO Standard 3741. See Krueger's selection software for performance data not shown.
© Copyright Krueger 2024
D1-9
DIFFUSERS | MODULAR CORE
1240, 51240 SERIES
Diffuser | Modular Core
PERFORMANCE DATA | 2-, 3-, 4-CORE, NO DAMPER
NECK SIZE
6" x 6"
8" x 8"
10" x 10"
12" x 12"
14" x 14"
NECK VEL FPM 300 400 500 600 700 800 900 1000 1100 300 400 500 600 700 800 900 1000 1100 300 400 500 600 700 800 900 1000 1100 300 400 500 600 700 750 800 900 1000 300 400 500 600 700 750 800 900 1000
AIR FLOW CFM
75 100 125 150 175 200 225 250 275 133 178 222 267 311 356 400 444 489 208 278 347 417 486 556 625 694 764 300 400 500 600 700 750 800 900 1000 408 544 681 817 953 1021 1089 1225 1361
IP DATA
2-CORE THROW
3-CORE THROW
ft
ft
6-8-11
7-9-13
7-9-13
9-10-15
8-10-14
10-12-17
9-11-16
10-13-18
10-12-17
11-14-20
11-13-18
12-15-21
11-14-19
13-16-22
12-14-20
13-17-23
12-15-21
14-17-24
8-11-15
9-12-17
10-12-17
11-14-20
11-14-19
13-16-22
12-15-21
14-17-24
13-16-23
15-18-26
14-17-24
16-20-28
15-18-26
17-21-30
16-19-27
18-22-31
16-20-29
19-23-33
10-13-19
11-15-21
12-15-21
14-17-25
14-17-24
16-19-28
15-19-26
17-21-30
16-20-28
19-23-33
18-21-30
20-25-35
19-23-32
21-26-37
20-24-34
22-28-39
21-25-36
24-29-41
12-16-22
14-18-26
15-18-26
17-21-30
17-20-29
19-23-33
18-22-32
21-26-36
20-24-34
23-28-39
20-25-35
23-29-40
21-26-36
24-30-42
22-27-39
26-31-44
24-29-41
27-33-47
14-18-26
16-21-30
17-21-30
20-24-34
19-24-34
22-27-39
21-26-37
24-30-42
23-28-40
26-32-46
24-29-41
27-33-47
25-30-43
28-34-49
26-32-45
30-37-52
27-34-48
31-39-54
4-CORE THROW
ft 9-11-16 10-13-18 12-14-20 13-16-22 14-17-24 15-18-25 16-19-27 16-20-28 17-21-30 12-15-21 14-17-24 15-19-27 17-21-29 18-22-32 19-24-34 21-25-36 22-27-38 23-28-40 15-18-26 17-21-30 19-24-33 21-26-37 23-28-39 24-30-42 26-32-45 27-33-47 29-35-49 18-22-31 21-25-36 23-28-40 25-31-44 27-33-47 28-35-49 29-36-51 31-38-54 33-40-57 21-26-36 24-30-42 27-33-47 30-36-51 32-39-55 33-40-57 34-42-59 36-44-63 38-47-66
NECK VEL m/s 1.52 2.03 2.54 3.05 3.56 4.06 4.57 5.08 5.59 1.52 2.03 2.54 3.05 3.56 4.06 4.57 5.08 5.59 1.52 2.03 2.54 3.05 3.56 4.06 4.57 5.08 5.59 1.52 2.03 2.54 3.05 3.56 3.81 4.06 4.57 5.08 1.52 2.03 2.54 3.05 3.56 3.81 4.06 4.57 5.08
AIR FLOW L/s
35 47 59 71 83 94 106 118 130 63 84 105 126 147 168 189 210 231 98 131 164 197 229 262 295 328 361 142 189 236 283 330 354 378 425 472 193 257 321 385 450 482 514 578 642
METRIC DATA
2-CORE THROW
3-CORE THROW
m
m
1.8-2.4-3.4
2.1-2.7-3.9
2.3-2.8-3.9
2.6-3.2-4.5
2.5-3.1-4.4
2.9-3.5-5.0
2.8-3.4-4.8
3.2-3.9-5.5
3.0-3.7-5.2
3.4-4.2-5.9
3.2-3.9-5.5
3.7-4.5-6.3
3.4-4.2-5.9
3.9-4.8-6.7
3.6-4.4-6.2
4.1-5.0-7.1
3.8-4.6-6.5
4.3-5.3-7.4
2.4-3.2-4.5
2.8-3.7-5.2
3.0-3.7-5.2
3.5-4.2-6.0
3.4-4.1-5.8
3.9-4.7-6.7
3.7-4.5-6.4
4.2-5.2-7.3
4.0-4.9-6.9
4.6-5.6-7.9
4.3-5.2-7.4
4.9-6.0-8.5
4.5-5.5-7.8
5.2-6.3-9.0
4.8-5.8-8.3
5.5-6.7-9.5
5.0-6.1-8.7
5.7-7.0-9.9
3.0-4.0-5.7
3.5-4.6-6.5
3.8-4.6-6.5
4.3-5.3-7.5
4.2-5.2-7.3
4.8-5.9-8.4
4.6-5.7-8.0
5.3-6.5-9.2
5.0-6.1-8.6
5.7-7.0-9.9
5.3-6.5-9.2
6.1-7.5-10.6
5.7-6.9-9.8
6.5-7.9-11.2
6.0-7.3-10.3
6.8-8.4-11.8
6.3-7.7-10.8
7.2-8.8-12.4
3.6-4.8-6.8
4.1-5.5-7.8
4.5-5.5-7.8
5.2-6.3-9.0
5.1-6.2-8.8
5.8-7.1-10.0
5.5-6.8-9.6
6.3-7.8-11.0
6.0-7.3-10.4
6.9-8.4-11.9
6.2-7.6-10.7
7.1-8.7-12.3
6.4-7.8-11.1
7.3-9.0-12.7
6.8-8.3-11.8
7.8-9.5-13.5
7.2-8.8-12.4
8.2-10.0-14.2
4.2-5.6-7.9
4.8-6.4-9.1
5.3-6.5-9.1
6.0-7.4-10.5
5.9-7.2-10.2
6.8-8.3-11.7
6.5-7.9-11.2
7.4-9.1-12.8
7.0-8.6-12.1
8.0-9.8-13.9
7.2-8.9-12.5
8.3-10.1-14.3
7.5-9.1-12.9
8.6-10.5-14.8
7.9-9.7-13.7
9.1-11.1-15.7
8.4-10.2-14.5
9.6-11.7-16.6
4-CORE THROW
m 2.7-3.3-4.7 3.1-3.8-5.4 3.5-4.3-6.1 3.8-4.7-6.7 4.2-5.1-7.2 4.4-5.4-7.7 4.7-5.8-8.2 5.0-6.1-8.6 5.2-6.4-9.0 3.6-4.4-6.3 4.2-5.1-7.3 4.7-5.7-8.1 5.1-6.3-8.9 5.5-6.8-9.6 5.9-7.3-10.3 6.3-7.7-10.9 6.6-8.1-11.5 6.9-8.5-12.0 4.5-5.6-7.9 5.2-6.4-9.1 5.9-7.2-10.1 6.4-7.9-11.1 6.9-8.5-12.0 7.4-9.1-12.8 7.9-9.6-13.6 8.3-10.1-14.3 8.7-10.6-15.0 5.4-6.7-9.4 6.3-7.7-10.9 7.0-8.6-12.2 7.7-9.4-13.3 8.3-10.2-14.4 8.6-10.5-14.9 8.9-10.9-15.4 9.4-11.5-16.3 9.9-12.2-17.2 6.3-7.8-11.0 7.3-9.0-12.7 8.2-10.0-14.2 9.0-11.0-15.5 9.7-11.9-16.8 10.0-12.3-17.4 10.4-12.7-18.0 11.0-13.5-19.0 11.6-14.2-20.1
NOTES: Throw values are given for terminal velocities of 150, 100, and 50 FPM (0.75, 0.50, and 0.25 m/s). Throw values are given for isothermal conditions. Data was obtained from tests conducted in accordance with ANSI/ASHRAE Standard 70, ISO Standard 5219, and ISO Standard 3741. See Krueger's selection software for performance data not shown.
D1-10
© Copyright Krueger 2024
DIFFUSERS | MODULAR CORE
1240, 51240 SERIES
Diffuser | Modular Core
PERFORMANCE DATA | 2-, 3-, 4-CORE, NO DAMPER
NECK SIZE
16" x 16"
18" x 18"
20" x 20"
22" x 22"
24" x 24"
NECK VEL FPM 300 400 500 600 700 750 800 900 1000 300 400 500 600 650 700 750 800 900 200 300 400 500 600 650 700 800 900 100 200 300 400 500 550 600 700 800 100 200 300 400 500 550 600 700 800
AIR FLOW CFM 533 711 889 1067 1244 1333 1422 1600 1778 675 900 1125 1350 1463 1575 1688 1800 2025 556 833 1111 1389 1667 1806 1944 2222 2500 336 672 1008 1344 1681 1849 2017 2353 2689 400 800 1200 1600 2000 2200 2400 2800 3200
IP DATA
2-CORE THROW
3-CORE THROW
ft
ft
16-21-30
18-24-34
20-24-34
23-28-39
22-27-38
25-31-44
24-30-42
28-34-48
26-32-45
30-37-52
27-33-47
31-38-54
28-34-49
32-39-56
30-36-52
34-42-59
31-38-54
36-44-62
18-24-34
20-27-38
22-27-39
26-31-44
25-31-43
29-35-50
27-34-47
31-38-54
28-35-49
33-40-56
30-36-51
34-41-59
31-37-53
35-43-61
32-39-55
36-44-63
34-41-58
38-47-66
9-20-30
11-23-35
20-26-37
23-30-43
25-30-43
28-35-49
28-34-48
32-39-55
30-37-53
35-43-60
32-39-55
36-44-63
33-40-57
38-46-65
35-43-61
40-49-70
37-46-64
43-52-74
2-5-22
3-7-25
10-22-33
13-25-38
22-29-41
25-33-47
27-33-47
31-38-54
31-37-53
35-43-61
32-39-55
37-45-64
33-41-58
38-47-66
36-44-63
41-51-72
39-47-67
44-54-77
6-14-26
8-18-30
21-26-36
24-30-42
26-32-45
30-36-51
30-36-52
34-42-59
33-41-58
38-47-66
35-43-60
40-49-69
36-45-63
42-51-72
39-48-68
45-55-78
42-52-73
48-59-84
4-CORE THROW
ft 24-29-41 28-34-48 31-38-53 34-41-58 36-45-63 38-46-65 39-48-68 41-51-72 44-53-75 27-33-47 31-38-54 35-42-60 38-47-66 40-48-68 41-50-71 42-52-74 44-54-76 47-57-81 15-30-42 30-37-52 34-42-60 39-47-67 42-52-73 44-54-76 46-56-79 49-60-84 52-63-89 4-9-33 16-33-46 33-40-57 38-46-66 42-52-73 44-54-77 46-57-80 50-61-87 54-66-93 10-23-36 29-36-51 36-44-62 41-51-72 46-57-80 48-59-84 51-62-88 55-67-95 58-72-101
NECK VEL m/s 1.52 2.03 2.54 3.05 3.56 3.81 4.06 4.57 5.08 1.52 2.03 2.54 3.05 3.30 3.56 3.81 4.06 4.57 1.02 1.52 2.03 2.54 3.05 3.30 3.56 4.06 4.57 0.51 1.02 1.52 2.03 2.54 2.79 3.05 3.56 4.06 0.51 1.02 1.52 2.03 2.54 2.79 3.05 3.56 4.06
AIR FLOW L/s 252 336 420 503 587 629 671 755 839 319 425 531 637 690 743 796 850 956 262 393 524 655 787 852 918 1049 1180 159 317 476 635 793 872 952 1110 1269 189 378 566 755 944 1038 1133 1321 1510
METRIC DATA
2-CORE THROW
3-CORE THROW
m
m
4.8-6.4-9.1
5.5-7.3-10.4
6.0-7.4-10.5
6.9-8.5-12.0
6.7-8.3-11.7
7.7-9.5-13.4
7.4-9.1-12.8
8.5-10.4-14.7
8.0-9.8-13.8
9.1-11.2-15.8
8.3-10.1-14.3
9.5-11.6-16.4
8.5-10.5-14.8
9.8-12.0-16.9
9.1-11.1-15.7
10.4-12.7-18.0
9.5-11.7-16.5
10.9-13.4-18.9
5.4-7.2-10.2
6.2-8.2-11.7
6.8-8.3-11.8
7.8-9.5-13.5
7.6-9.3-13.1
8.7-10.6-15.1
8.3-10.2-14.4
9.5-11.7-16.5
8.7-10.6-15.0
9.9-12.1-17.2
9.0-11.0-15.6
10.3-12.6-17.8
9.3-11.4-16.1
10.6-13.0-18.4
9.6-11.8-16.6
11.0-13.5-19.0
10.2-12.5-17.6
11.7-14.3-20.2
2.6-6.0-9.2
3.5-6.9-10.6
6.0-8.0-11.3
6.9-9.2-13.0
7.5-9.2-13.1
8.6-10.6-15.0
8.4-10.3-14.6
9.7-11.8-16.7
9.2-11.3-16.0
10.6-13.0-18.3
9.6-11.8-16.7
11.0-13.5-19.1
10.0-12.2-17.3
11.4-14.0-19.8
10.7-13.1-18.5
12.2-15.0-21.2
11.3-13.9-19.6
13.0-15.9-22.4
0.7-1.6-6.6
1.0-2.2-7.6
2.9-6.6-10.2
3.8-7.6-11.6
6.6-8.8-12.4
7.6-10.1-14.3
8.3-10.2-14.4
9.5-11.6-16.5
9.3-11.4-16.1
10.6-13.0-18.4
9.7-11.9-16.9
11.1-13.7-19.3
10.2-12.4-17.6
11.6-14.3-20.2
11.0-13.4-19.0
12.6-15.4-21.8
11.7-14.4-20.3
13.4-16.5-23.3
1.9-4.2-7.8
2.5-5.5-9.0
6.4-7.8-11.1
7.3-9.0-12.7
7.8-9.6-13.6
9.0-11.0-15.6
9.1-11.1-15.7
10.4-12.7-18.0
10.1-12.4-17.5
11.6-14.2-20.1
10.6-13.0-18.4
12.2-14.9-21.1
11.1-13.6-19.2
12.7-15.6-22.0
12.0-14.7-20.7
13.7-16.8-23.8
12.8-15.7-22.2
14.7-18.0-25.4
4-CORE THROW
m 7.2-8.9-12.6 8.4-10.3-14.5 9.4-11.5-16.2 10.3-12.6-17.8 11.1-13.6-19.2 11.5-14.0-19.9 11.8-14.5-20.5 12.6-15.4-21.8 13.2-16.2-22.9 8.1-10.0-14.1 9.4-11.5-16.3 10.5-12.9-18.3 11.5-14.1-20.0 12.0-14.7-20.8 12.5-15.3-21.6 12.9-15.8-22.4 13.3-16.3-23.1 14.1-17.3-24.5 4.5-9.0-12.8 9.0-11.1-15.7 10.5-12.8-18.1 11.7-14.3-20.3 12.8-15.7-22.2 13.3-16.3-23.1 13.9-17.0-24.0 14.8-18.1-25.7 15.7-19.2-27.2 1.2-2.8-9.9 4.9-9.9-14.1 9.9-12.2-17.3 11.5-14.1-20.0 12.9-15.8-22.3 13.5-16.5-23.4 14.1-17.3-24.4 15.2-18.7-26.4 16.3-20.0-28.2 3.2-7.1-10.9 8.9-10.9-15.4 10.9-13.3-18.8 12.6-15.4-21.8 14.0-17.2-24.3 14.7-18.0-25.5 15.4-18.8-26.7 16.6-20.4-28.8 17.8-21.8-30.8
NOTES: Throw values are given for terminal velocities of 150, 100, and 50 FPM (0.75, 0.50, and 0.25 m/s). Throw values are given for isothermal conditions. Data was obtained from tests conducted in accordance with ANSI/ASHRAE Standard 70, ISO Standard 5219, and ISO Standard 3741. See Krueger's selection software for performance data not shown.
© Copyright Krueger 2024
D1-11
DIFFUSERS | MODULAR CORE
1240, 51240 SERIES
Diffuser | Modular Core
ENGINEERING SPECIFICATION & CONFIGURATION
1240, 51240 The modular core diffuser shall be Krueger model 1240 (steel) or 51240 (aluminum). The 1240 and 51240 models shall have a tapered backpan resulting in a square neck. The core of the diffuser shall be made up of 4 independent fixed blade modules that can be easily removed without the use of special tools for 1-, 2-, 3-, or 4-way discharge air pattern adjustments or damper access.
Optional opposed blade damper (OBD1240) shall be constructed of heavy gage steel. Damper shall be operable from the face of the diffuser.
PERFORMANCE The manufacturer shall provide published (printed or electronic) performance data for the diffuser. Performance data shall include 2 - 7 octave band sound power levels. The diffuser shall be tested in accordance to the data standards at the time of product introduction or ANSI/ASHRAE Standard 70.
FINISH The paint finish shall be #44 British White and be an anodic acrylic paint, baked at 315°F for 30 minutes. The paint thickness shall be 0.8 1.0 mils, gloss at 60° per ASTM D523-89 of 50 85%, pencil hardness per ASTM D3363-92A of HB H, crosshatch adhesion per ASTM D3359-83 of 4B 5B, impact per ASTM D2794-93 of direct impact >100 in/lb and reverse impact >80 in/lb, salt spray per ASTM B117-9048 of 96 hours, humidity per ASTM D2247-92 of >500 hours and water soak per ASTM D870-92 of 250 hours.
1. SERIES: (XXXXX) 1240 - Steel, Modular Core Diffuser 51240 - Aluminum, Modular Core Diffuser
2. WIDTH: SQUARE NECK ONLY (XX) * 6" - 24" in 2" Increments
3. HEIGHT: SQUARE NECK ONLY (XX) * 6" - 24" in 2" Increments
4. FRAME: (XXX) F21 - Surface Mount - Beveled F22 - Surface Mount - Flat F23 - Lay-in T-Bar F29 - Camlock F30 - Drop Face F98 - Narrow-T
5. PANEL: (XX)x(XX) NONE 24"x24 "
6. FINISH: (XX) 01 - Mill 10 - Alumican 35 - Black 44 - British White
Damper not included in configuration code. * Neck Sizes of 22" and 24" are only available for Frame 21 and
Frame 22.
SAMPLE CONFIGURATION: 1240 - 14x14 - F21 - NONE - 44
D1-12
© Copyright Krueger 2024
Nitro Pro 13 (13.70.2.40)