The common solutions to this ice problem are to use a higher powered fan use a larger diameter shorter duct run and wrap the pipe with better duct insulation.
Cover bathroom exhaust fan insulation.
Bath fans have a damper designed to keep the outside air from entering in through the fan but that valve doesn t stop warm air from escaping.
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If your ducts are properly insulated another potential cause of condensation is lack of use.
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Insulating around a bathroom exhaust fan.
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Bathroom vent fan ductwork insulation.
However you will be suffering more likely because of the poor insulation.
It s a diy project and if you love to do some small diy projects probably you already have all the things you need.
You can also run the fan longer at least 10 to 15 minutes after showering is a good baseline so the ice melts or doesn t freeze in the first place.
The ducting of your exhaust fan should be properly insulated.
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Insulate the bathroom exhaust vent fan ducts.
Use zip ties or aluminum tape to fasten the insulation.
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In un conditioned space such as an attic where otherwise your fan duct will be exposed to cold attic air in winter use insulated solid metal ducting or insulated flex duct.
Otherwise the warm moist air will condense inside the duct.