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I can answer this for those that experience this with the HTP PH-LD. these are vary nice stainless steel machines. It can be corrected with an offset adjustment on the gas valve. An experienced technician can adjust this to run perfectly and not have any sound. The fan speed can also be turned down in the program but don't turn it down for the noise. This ...


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The 2015 IRC (international residential code) requires a 50 cfm fan in the laundry and bath rooms - the exhaust fan is for moisture control


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Put a drop of super glue on the bare shaft, then slide the impeller fully into place. Put the nut on without gluing it. Leave it for an hour so the glue can set up. You could also use a threadlocker liquid on the shaft. I have repaired loose impellers for combustion air fans inhigh efficiency furnaces. I also use this repair for bath fans and rangehoods.


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