Basic Documentation
Table Of Contents
- About this Application Guide
- Chapter 1–Introduction
- Chapter 2–Physics of Sound
- Chapter 3–HVAC Sound Sources
- Chapter 4–HVAC Sound Attenuation
- Introduction to HVAC Sound Attenuation
- Plenums
- Duct Attenuation
- Duct Takeoffs and Divisions
- Duct Silencers
- End Reflection
- Environment Adjustment Factor
- Space Effect
- Radiated Sound Attenuation
- Chapter 5–HVAC System Sound Analysis
- Chapter 6–Minimizing HVAC Sound
- Appendix
- Glossary
- Index
Duct Attenuation
P/A 63 125 250 500 1,000 2,000 4,000 8,000
Hz Hz Hz Hz Hz Hz Hz Hz
9.00 1.28 1.43 1.75 3.16 8.27 8.22 4.21 2.67
8.40 1.16 1.32 1.66 3.05 7.80 7.78 4.07 2.63
8.00 1.08 1.24 1.60 2.98 7.62 7.48 3.98 2.60
6.40 0.82 0.96 1.35 2.66 6.52 6.26 3.59 2.46
6.00 0.77 0.90 1.29 2.57 6.23 5.94 3.49 2.42
5.33 0.69 0.79 1.18 2.42 5.74 5.41 3.31 2.36
5.00 0.65 0.74 1.12 2.34 5.49 5.13 3.21 2.32
4.80 0.63 0.71 1.09 2.29 5.34 4.97 3.15 2.30
4.33 0.60 0.67 1.04 2.22 5.10 4.72 3.06 2.26
4.00 0.56 0.60 0.96 2.09 4.70 4.29 2.90 2.20
3.90 0.55 0.59 0.94 2.06 4.62 4.21 2.86 2.19
3.60 0.53 0.55 0.89 1.98 4.37 3.94 2.76 2.15
3.33 0.51 0.52 0.85 1.90 4.14 3.71 2.67 2.11
3.20 0.51 0.51 0.82 1.87 4.02 3.59 2.62 2.09
3.00 0.50 0.48 0.79 1.81 3.85 3.41 2.54 2.06
2.70 0.40 0.44 0.75 1.71 3.57 3.12 2.42 2.01
2.66 0.40 0.43 0.74 1.70 3.54 3.10 2.41 2.00
2.40 0.36 0.39 0.68 1.61 3.29 2.85 2.29 1.96
2.19 0.33 0.35 0.64 1.54 3.09 2.65 2.20 1.91
2.13 0.32 0.34 0.62 1.52 3.03 2.59 2.17 1.90
2.00 0.30 0.32 0.59 1.47 2.90 2.24 2.00 1.82
1.77 0.27 0.28 0.54 1.38 2.67 2.24 2.00 1.82
1.66 0.25 0.26 0.51 1.34 2.55 2.13 1.94 1.80
1.50 0.23 0.24 0.47 1.27 2.37 1.95 1.85 1.76
1.33 0.21 0.21 0.43 1.20 2.19 1.78 1.75 1.71
1.20 0.19 0.19 0.39 1.13 2.03 1.63 1.67 1.67
1.14 0.18 0.18 0.38 1.11 1.96 1.57 1.63 1.65
1.11 0.18 0.17 0.37 1.09 1.93 1.54 1.61 1.64
1.00 0.16 0.16 0.34 1.03 1.79 1.41 1.54 1.60
0.95 0.16 0.15 0.32 1.01 1.72 1.35 1.50 1.58
0.86 0.14 0.14 0.30 0.96 1.61 1.25 1.43 1.55
0.83 0.14 0.13 0.29 0.94 1.58 1.22 1.42 1.54
Siemens Building Technologies, Inc. 55