I just got a NuTone QTXEN110 and it is much larger than the old fan and also uses a 6" exhaust. The old fan is connected to a 4" exhaust duct. Is it OK to use a reducer and go from 6" to 4" or would that be bad for the fan? The bathroom is 45sqft with 8' ceilings so I believe the 110cfm...
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