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Context for readings: 35 dB: Whisper quiet (bedroom acceptable for light sleepers) 45 dB: Quiet conversation (living room acceptable) 55 dB: Normal conversation volume (daytime acceptable) 65+ dB: Loud, disruptive (not acceptable for occupied spaces) Test 4: Power Consumption Measurement I measure actual wattage draw on every fan speed over a 24-hour period, then calculate annual energy costs at $0.15/kWh (U.S