
VAV-PRC011M-EN 73
Dual-Duct VAV Terminal Units
Table 44. Sound noise criteria (NC)
Discharge
1,2,4
Radiated
1,2,4
Inlet
Size (in)
Inlet Pressure (Ps)
3,5
Inlet
Size (in)
Inlet Pressure (Ps)
3,5
CFM l/s 0.5” 1.0” 1.5” 2.0” 3.0” CFM l/s 0.5” 1.0” 1.5” 2.0” 3.0”
5
130 61 -- -- 16 21
5
130 61 -- -- 16 20
200 94 -- 20 25 25 "200 94 -- 18 22 25
250 118 19 24 28 30 30 250 118 17 20 24 25 28
350 165 28 32 38 41 350 165 22 26 30 33
6
200 94 -- 16 21 20
6
200 94 -- 16 21 23
300 142 19 23 30 30 "300 142 19 21 26 30
400 189 23 30 33 35 38 400 189 20 27 30 30 33
500 236 20 33 43 44 500 236 20 30 36 38
8
350 165 16 24 28 28
8
300 142 17 24 28 31
520 245 20 30 38 38 500 236 20 27 34 37
700 330 23 33 38 43 46 700 330 24 31 34 38 44
900 425 25 34 44 51 900 425 25 34 42 46
10
550 260 16 26 32 32
10
500 236 20 25 30 34
820 387 20 30 39 39 800 378 22 29 36 39
1100 519 24 33 39 43 46 1100 519 22 31 36 39 43
1400 661 28 35 46 50 1400 661 24 35 43 47
12
800 378 21 32 38 38
12
650 307 24 30 35 38
1200 566 27 38 46 46 1100 519 27 36 42 44
1550 732 1550 732 29 39 49 52
1600 755 27 39 47 50 52 1600 755 45
2000 944 29 39 54 56 2000 944 30 42 54 58
14
1100 519 21 33 39 39
14
900 425 20 31 38 39
1600 755 24 34 45 46 1500 708 24 34 43 47
2100 991 27 37 42 46 47 2100 991 26 36 43 45 51
3000 1416 32 41 48 52 3000 1416 30 42 54 58
16
1400 661 20 32 39 41
16
1200 566 20 29 39 42
2100 991 21 33 43 46 2000 944 22 31 42 45
2800 1321 24 33 39 43 48 2800 1321 40
3000 1416 3000 1416 25 34 45 52
4000 1888 28 37 47 51 4000 1888 31 36 52 60
Notes:
1. "--" represents NC levels below NC 15.
2. NC Values are calculated using modeling assumptions based on AHRI 885-2008-02 Addendum.
3. Data at 1.5" inlet pressure constitute AHRI 880-2011 Standard Rating Conditions
4. Where Ps is the inlet static pressure minus discharge static.
5. Data at 0.5", 1.0", 2.0"& 3.0" are application ratings. These ratings are outside the scope of the certification program.
Table 45. AHRI 885-2008 radiated transfer function assumptions
Octave Band
23 4 5 6 7
Type 2- Mineral Fiber Insulation
Total dB reduction
-18
-18
-19
-19
-20
-20
-26
-26
-31
-31
-36
-36
Notes: Subtract from terminal unit sound power to determine radiated sound pressure in the space.
1. NC Values are calculated using modeling assumptions based on AHRI 885-2008.
2. Where DPs is inlet static pressure minus discharge static pressure.
3. Application ratings are outside the scope of the Certification Program.
Table 46. AHRI 885-2008 discharge transfer function assumptions
Octave Band
23456 7
Small Box (<300 Cfm)
Medium Box (300-700 Cfm)
Large Box (>700 Cfm)
-24
-27
-29
-28
-29
-30
-39
-40
-41
-53
-51
-51
-59
-53
-52
-40
-39
-39
Notes: Subtract from terminal unit sound power to determine discharge sound pressure in the space.
1. NC Values are calculated using modeling assumptions based on AHRI 885-2008.
2. Where DPs is inlet static pressure minus discharge static pressure.
3. Application ratings are outside the scope of the Certification Program.
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