Fan noise (dB(A))

⚠ Usually quoted in eco mode as a sound-pressure figure, often without a stated distance. ISO/IEC 21118 (optional item) asks for sound pressure at bystander positions per ISO 11201 and sound power per ISO 7779 (in bels), with the operating mode. Almost nobody follows it fully. Store per mode, with a measured_in_mode field. ⚖ noise.db_normal, noise.db_eco, observed.noise_db_measured ↓