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Did Panasonic Make a Contractor-Proof Bath Fan ?

This report discusses a comprehensive study of the Panasonic Whisper Green Fan, focusing on its performance in different installation scenarios. Conducted at the Data, Not Dogma workshop in Goldendale, WA, the experiment measured air flow, energy use, and static pressure under real-world duct conditions. Key findings include variations in CFM based on duct type, elbow placement, and termination methods, revealing how certain installation mistakes can impact performance. The fan qualifies as energy-efficient, running 24/7 for less than $20 annually, even with suboptimal setups.

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Did Panasonic Make a Contractor-Proof Bath Fan ?

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  1. Did Panasonic Make a Contractor-Proof Bath Fan? Ben Hannas -- ben@hannasanalytics.com Jonathan Coulter -- jcoulter@advancedenergy.org Bruce Manclark -- brucemanclark@gorge.net Data, Not Dogma - July 18-19, 2011 - Goldendale, WA Measuring Air Flow, Energy Use, and Static Pressure in a Variety of As-Installed Conditions

  2. The Test Setup

  3. Panasonic Whisper GreenFan Controls • Dial-in CFM • Timer not visible to homeowner

  4. Metering

  5. Variables • Duct type (metal flex, sheet metal) • Elbow placement (immediate, 2-3’) • Flap (open, screwed shut) • Termination (forced passive, duct roof vent) • Grille (with, without) • Installation type (perfect, small oops, they probably won’t catch this mistake)

  6. Baseline and Ideal • Baseline • No duct, open flap, with grille • 136 CFM, 1.5 Pa, 10 Watt • Ideal • 2 feet straight before elbow, 5 feet up to roof duct vent termination • 143 CFM, 45 Pa, 19.8 Watt

  7. Duct Type • No change between metal flex and sheet metal in ideal setup • 141 CFM, 22-24 Pa, 15 Watt

  8. Changing the Termination • Passive attic vent used as duct termination • Shove it in and seal it • 142 CFM, 22.2 Pa, 14.8 Watt • Duct roof vent • Meets code • 143 CFM, 45.0 Pa, 19.8 Watt • As a note, running fan 24/7 at this rate is <$20/year

  9. Real-world Duct Run • We have a ladder and a phantom truss in the way! • CFM increased slightly (5 CFM) • Static pressure doubled to 46 Pa • Energy increased slightly, up to 21 Watt

  10. Damper • With the same realistically awkward duct run, now tape the damper shut (but that never happens in real life) • CFM dropped almost in half, but still pulled 87 CFM • Static pressure jumped from 46 Pa to 128 Pa • Watts increased slightly, from 21 to 23 Watts

  11. Calibrated Crush • The “small oops” scenario • Damper open, but complex duct run • No change in CFM • Static increases from46 Pa to 60 Pa • Watts increase from21 to 24

  12. Maybe They Won’t Notice

  13. Maybe They Won’t Notice • Still pulled 57 CFM • 140 Pa • Only 20 Watt

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