04 PERFORMANCE DATA LINEAR SLOT DIFFUSERS PRODUCTS TESTING The following tables include the results of tests conducted on three linear slot diffusers. The test result Include Noise Criteria (NC), static pressure versus air flow, throw and Ak. The diffusers were selected and supplied by Beta in October 1991. The extrapolations and interpolations were made to cover a full range of sizes and parameters according to ETL testing laboratories Inc. who made the tests. TEST METHOD The air diffusers were tested in accordance with the Air diffusion council test code for grilles, registers and diffusers No. ADC 1062:GRD-84, the test was conducted in ETL testing laboratories. The diffusers were installed in the ADC facility and supplied with measured volume of air. The static pressure was measured (1-1.5) duct diameters upstream of the diffuser inlet. Acoustical data was obtained employing Bruel and Kjaer digital frequency analyzers, and analyzed by computer. Sound power levels were plotted on a graph of noise criteria curves which are in ADC codes. NOTES
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PERFORMANCE DATA LINEAR SLOT DIFFUSERS PERFORMANCE DATA · LINEAR SLOT DIFFUSERS PRODUCTS TESTING The following tables include the results of tests conducted on three linear slot
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CFM Per Meter : Air volume in cubic feet per 1 meter length
Ak : Effective face area in square feet per meter
Ps : Static pressure in inch water gauge
Th : Throw in feet NC : Noise Criteria
SYMBOLS* Supply* Vertical Discharge flow pattern* Noise Criteria Values are based on (10 dB) room attenuation.* Damper is fully open* The tested specimens were of 1 meter length
CONDITIONS* The large throw values are based on the minumum terminal velocity of 50 fpm.* The middle throw values are based on the middle terminal velocity of 100 fpm* The small throw values are based on the maximum terminal velocity of 150 fpm.
NOTES
04
PERFORMANCE DATA
LINEAR SLOT DIFFUSERS
PRODUCTS TESTING
The following tables include the results of tests conducted on three linear slot diffusers. The test result Include
Noise Criteria (NC), static pressure versus air flow, throw and Ak. The diffusers were selected and supplied by
Beta in October 1991. The extrapolations and interpolations were made to cover a full range of sizes and
parameters according to ETL testing laboratories Inc. who made the tests.
TEST METHOD
The air diffusers were tested in accordance with the Air diffusion council test code for grilles, registers and
diffusers No. ADC 1062:GRD-84, the test was conducted in ETL testing laboratories.
The diffusers were installed in the ADC facility and supplied with measured volume of air. The static pressure was
measured (1-1.5) duct diameters upstream of the diffuser inlet.
Acoustical data was obtained employing Bruel and Kjaer digital frequency analyzers, and analyzed by computer.
Sound power levels were plotted on a graph of noise criteria curves which are in ADC codes.
CFM Per Meter : Air volume in cubic feet per 1 meter length
Ak : Effective face area in square feet per meter
Ps : Static pressure in inch water gauge
Th : Throw in feet NC : Noise Criteria
SYMBOLS* Supply* Vertical Discharge flow pattern* Noise Criteria Values are based on (10 dB) room attenuation.* Damper is fully open* The tested specimens were of 1 meter length
CONDITIONS* The large throw values are based on the minumum terminal velocity of 50 fpm.* The middle throw values are based on the middle terminal velocity of 100 fpm* The small throw values are based on the maximum terminal velocity of 150 fpm.
NOTES
04
PERFORMANCE DATA
LINEAR SLOT DIFFUSERS
PRODUCTS TESTING
The following tables include the results of tests conducted on three linear slot diffusers. The test result Include
Noise Criteria (NC), static pressure versus air flow, throw and Ak. The diffusers were selected and supplied by
Beta in October 1991. The extrapolations and interpolations were made to cover a full range of sizes and
parameters according to ETL testing laboratories Inc. who made the tests.
TEST METHOD
The air diffusers were tested in accordance with the Air diffusion council test code for grilles, registers and
diffusers No. ADC 1062:GRD-84, the test was conducted in ETL testing laboratories.
The diffusers were installed in the ADC facility and supplied with measured volume of air. The static pressure was
measured (1-1.5) duct diameters upstream of the diffuser inlet.
Acoustical data was obtained employing Bruel and Kjaer digital frequency analyzers, and analyzed by computer.
Sound power levels were plotted on a graph of noise criteria curves which are in ADC codes.
NOTES
07
LINEAR SLOT DIFFUSERS
PERFORMANCE DATA
SLOT WIDTH
1
2
3
4
5
6
75
100
125
150
175
150
175
200
250
300
200
250
300
350
450
300
350
400
500
600
300
400
500
600
700
400
500
600
700
800
0.133
0.234
0.359
0.544
0.734
0.156
0.228
0.283
0.438
0.625
0.156
0.244
0.352
0.478
0.794
0.250
0.339
0.438
0.661
0.981
0.175
0.309
0.484
0.695
0.945
0.244
0.380
0.547
0.742
0.972
SLOTSCFM PERMETER
Neg. PS
(IWG)
0.085
0.150
0.230
0.348
0.470
0.100
0.146
0.181
0.280
0.400
0.100
0.156
0.225
0.306
0.508
0.160
0.217
0.280
0.423
0.628
0.112
0.198
0.310
0.445
0.605
0.156
0.243
0.350
0.475
0.622
Neg. PS
(IWG)
0.054
0.096
0.147
0.223
0.301
0.064
0.093
0.116
0.179
0.256
0.064
0.100
0.144
0.196
0.325
0.102
0.139
0.179
0.271
0.402
0.072
0.127
0.198
0.285
0.387
0.100
0.156
0.224
0.304
0.398
Neg. PS
(IWG)
19
26
35
44
50
19
26
31
40
48
20
28
34
41
49
23
30
35
43
50
21
30
38
43
50
24
31
39
44
50
NC
19
25
32
39
44
19
25
29
36
42
20
26
31
37
43
22
28
32
38
44
21
28
34
38
44
23
29
35
39
44
NC
<15
17
22
28
32
<15
17
20
26
30
<15
18
22
26
31
<15
19
22
27
32
<15
19
24
27
32
15
20
25
28
32
NC
3/5" 4/5" 1"
SLD / RLD - RETURN
CFM Per Meter : Air volume in cubic feet per 1 meter lengthPs : Negative static pressure in inch water gaugeNC : Noise Criteria
SYMBOLS* Return* Noise Criteria Values are based on (10 dB) room attenuation.* Damper is fully open* The tested specimens were of 1 meter length
CFM Per Meter : Air volume in cubic feet per 1 meter length
Ak : Effective face area in square feet per meter
Ps : Static pressure in inch water gauge
Th : Throw in feet NC : Noise Criteria
SYMBOLS* Supply* Horizontal Discharge flow pattern* Noise Criteria Values are based on (10 dB) room attenuation.* Damper is fully open* The tested specimens were of 1 meter length
CONDITIONS* The large throw values are based on the minumum terminal velocity of 50 fpm.* The middle throw values are based on the middle terminal velocity of 100 fpm* The small throw values are based on the maximum terminal velocity of 150 fpm.
NOTES
07
LINEAR SLOT DIFFUSERS
PERFORMANCE DATA
SLOT WIDTH
1
2
3
4
5
6
75
100
125
150
175
150
175
200
250
300
200
250
300
350
450
300
350
400
500
600
300
400
500
600
700
400
500
600
700
800
0.133
0.234
0.359
0.544
0.734
0.156
0.228
0.283
0.438
0.625
0.156
0.244
0.352
0.478
0.794
0.250
0.339
0.438
0.661
0.981
0.175
0.309
0.484
0.695
0.945
0.244
0.380
0.547
0.742
0.972
SLOTSCFM PERMETER
Neg. PS
(IWG)
0.085
0.150
0.230
0.348
0.470
0.100
0.146
0.181
0.280
0.400
0.100
0.156
0.225
0.306
0.508
0.160
0.217
0.280
0.423
0.628
0.112
0.198
0.310
0.445
0.605
0.156
0.243
0.350
0.475
0.622
Neg. PS
(IWG)
0.054
0.096
0.147
0.223
0.301
0.064
0.093
0.116
0.179
0.256
0.064
0.100
0.144
0.196
0.325
0.102
0.139
0.179
0.271
0.402
0.072
0.127
0.198
0.285
0.387
0.100
0.156
0.224
0.304
0.398
Neg. PS
(IWG)
19
26
35
44
50
19
26
31
40
48
20
28
34
41
49
23
30
35
43
50
21
30
38
43
50
24
31
39
44
50
NC
19
25
32
39
44
19
25
29
36
42
20
26
31
37
43
22
28
32
38
44
21
28
34
38
44
23
29
35
39
44
NC
<15
17
22
28
32
<15
17
20
26
30
<15
18
22
26
31
<15
19
22
27
32
<15
19
24
27
32
15
20
25
28
32
NC
3/5" 4/5" 1"
SLD / RLD - RETURN
CFM Per Meter : Air volume in cubic feet per 1 meter lengthPs : Negative static pressure in inch water gaugeNC : Noise Criteria
SYMBOLS* Return* Noise Criteria Values are based on (10 dB) room attenuation.* Damper is fully open* The tested specimens were of 1 meter length
CFM Per Meter : Air volume in cubic feet per 1 meter length
Ak : Effective face area in square feet per meter
Ps : Static pressure in inch water gauge
Th : Throw in feet NC : Noise Criteria
SYMBOLS* Supply* Horizontal Discharge flow pattern* Noise Criteria Values are based on (10 dB) room attenuation.* Damper is fully open* The tested specimens were of 1 meter length
CONDITIONS* The large throw values are based on the minumum terminal velocity of 50 fpm.* The middle throw values are based on the middle terminal velocity of 100 fpm* The small throw values are based on the maximum terminal velocity of 150 fpm.