BNBC 2020 · Part 8 — Building Services
Appendix J — Speech Privacy Analysis Sheet
Gazette pages 4972–4973 · Official gazette pages (PDF, 344 KB) — use for exact tables and figures.
Figure 8.J.1 Speech Privacy Analysis Sheet (Source: Egan, M. D. 1972. Concepts in Architectural Acoustics, McGraw-Hill Book Company, New York)
Source: Bangladesh National Building Code 2020, S.R.O. No. 55-Law/2020, Bangladesh Gazette (Extraordinary), 11 February 2021. Tables, figures and equations: refer to the linked gazette pages.