| Application | Certified dB Reduction | Effect | Product |
| Conference Centres & Hotels Requiring Full Confidentiality. |
48+ |
Audio/Video equipment or shouting heard with difficulty. | 500 or 600 |
| Hotels & Offices. | 45 to 48 | Loud speech faintly heard but not distinguishable. | 500 |
| Education & Training. | 38 to 46 | Loud speech heard but not easily distinguishable. | 500 or 200 |
|
Leisure, Sport & Education. |
32 to 41 | Normal speech faintly heard. | 500, 200 or 800 |
| Community Centres & Schools. | 15 to 38 | Loud speech easily overheard. | 200 or 800 |