![]() There are several other sources of water in the house, particularly close to the bathroom. It may be that the water is dripping onto uninsulated ducts and the sound is carried through the ductwork and out the fan vent. The dripping sound may not be coming from inside the fan’s ductwork. A similar thing is happening in our air ducts. One will absorb the sound, making it almost inaudible, and the other will amplify it. They don’t absorb much of the vibration, but rather assist in carrying it further.įor example, imagine water dripping into soft soil versus dripping into an empty plastic bucket. ![]() Each of these materials can contribute to magnifying the sound made within the ducts. This is because there is a lot of space for the sound waves to move in and not a lot of material to absorb the vibrations.īathroom ducts are often made from materials such as plastic, metal, and fiberglass. The less dense the medium is, the louder the sound will be.Īir ducts carry sound and may even amplify it. Sound is energy created from vibrations that travel through different mediums (air, metal, water, etc.). If these are sharp enough, then the water will gather at a point at one part of the duct and drip down onto another part of the duct. This would be best, but it’s not a viable option in the majority of cases.Īlmost all bathroom exhaust systems have bends and inclines. You would think that the water is more likely to run along the duct walls as opposed to dripping through the metal pipes. If there is something wrong with the external termination vent (the hood is damaged or poorly installed or the flashing has failed, then snow and rain can drip down into the duct. Up to now, we have spoken about condensation, but it’s not the only potential source of water in your bathroom ducts. You will also likely end up with condensation on your ceiling and walls. If the fan is too weak, it will not be able to remove excessive moisture from the bathroom quickly enough. The air has more time to cool inside the duct, resulting in condensation.Īnother way that the steamy bathroom air could start to condense in the duct is if the fan is underpowered. When the volume of air inside the ducts decreases, it reduces the rate at which the air moves through the duct. There is another way that cracked ducts can result in condensation and this is via the loss of exhausted air through these cracks. The overall air temperature in the ducts decreases and water condenses out when the temperature drops below the dew point. Then, when the fan is operating, the air entering the ducts comes into contact with this cold air, and heat is transferred (shared among more air molecules). When there are cracks in the bathroom duct system, cold air can enter the ducts when the fan is off. This is more likely to happen or to be more pronounced if the ducts are uninsulated and in cold weather. When the hot, steamy bathroom air comes into contact with cold ducts, the air cools down and water condenses out. Was this helpful? Sources of Water in Bathroom DuctsĬondensation is one of the main sources of water in air ducts.
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