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Old 01-24-2012, 10:31 PM  
dan897857
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Ok cool.....so my solutions now are either change the duct size or vent it straight up through roof instead of down through soffit.



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Old 01-24-2012, 10:49 PM  
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Do both and there will be nothing else you can do without going for a different fan.



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Old 01-25-2012, 01:26 AM  
BridgeMan
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Experienced sheet metal guys will tell you that you have a "junk air" problem. A natural, relatively smooth flow of air molecules is being compromised by multiple changes in direction and small (but significant) in-line restrictions. I strongly suspect that changing the run to vent vertically through the roof would be significantly more advantageious than going down through the soffit. I don't ever recall seeing a bath fan run increased from 4" to 6" to improve flow in the (40) years I've been looking at them. And a marginal fan pushing into a larger run and transition will definitely create more junk air.

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Old 01-25-2012, 01:32 AM  
dan897857
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That sounds good, and the fan is literally a half foot from the roof so it would be traveling about 4 feet less than it is now out the soffit.....and of course up rather than over and down.

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Old 01-25-2012, 03:12 AM  
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I may if I get sick of it but seems like a fairly easy DIY project ......the fan installation was the hard part

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Old 01-25-2012, 10:32 AM  
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When it is out the soffit the moist air will come back in the soffit vent and cause moisture problems and mold in the attic.



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