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50 VAV-PRC011M-EN
Single-Duct VAV Terminal Units
Table 34. AHRI 885-2008 discharge transfer function assumptions
Octave Band
23 4 567
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: Add to terminal unit sound power to determine discharge sound pressure in the space.
1. “—” represents NC levels below NC 15.
2. NC Values are calculated using current Industry Standard AHRI 885-2008. Radiated Transfer Function obtained from Appendix E, Type 2 Mineral Fiber
Insulation.
3. Where Ps is inlet static pressure minus discharge static pressure.
4. Application ratings are outside the scope of the Certification Program.
Table 35. AHRI 885-2008 radiated transfer function assumptions
Octave Band
234567
Type - Mineral Fiber -18 -19 -20 -26 -31 -36
Notes: Select the ceiling type which most closely represents the application. Next, add to terminal unit sound power to determine radiated sound
pressure in the space.
1. “—” represents NC levels below NC 15.
2. NC Values are calculated using current Industry Standard AHRI 885-2008. Radiated Transfer Function obtained from Appendix E, Type 2 Mineral Fiber
Insulation.
3. Where Ps is inlet static pressure minus discharge static pressure.
4. Application ratings are outside the scope of the Certification Program.
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