insertion loss from attenuators / acoustic louvers; barriers & berms 10-20 dB (mid/high); enclosures 10-20 dB
5-15 dBobserved
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| As of | 2026 |
| Source | EESI / Ramboll mitigation guidance |
| Review | checking…review by 2026-11-23 · standard cadence |
| Recorded changes | last 2026-06-29 |
| Claim id | insertion-loss-from-attenuators-acoustic |
Where the guide uses it
Not quoted in a chapter yet; it is kept in the curated register.
← Full numbers register — every date-stamped figure in the guide, with revision history.