Why is my bathroom exhaust fan dripping?

Many people notice the issue when the bathroom exhaust fan starts dripping on their head as they step out after a shower. The usual cause is condensation inside the duct. In winter, when the warm moist air from the bathroom hits cool air in the attic or outdoors, it condenses, sending drips back down the ductwork.Click to see full answer. People also ask, why is there water dripping out of my bathroom exhaust fan? The cause of condensation Water stains on the ceiling around your bath fan may indicate a leak coming from the vent cap on your roof, but condensation is the more likely culprit. If bath fan ducting isn’t properly insulated, the moist air from your house will condense inside the duct.Likewise, what is maximum duct length for bathroom exhaust fan? Fantech recommends a minimum of eight feet of insulated flex duct between the exhaust inlet register or grille and the fan motor. The company does not cite a maximum exhaust duct length. Maximum vent fan duct lengths are discussed in a reader Q&A below. Similarly, it is asked, how long should you run a bathroom exhaust fan? According to the Ask the Electrician Web site, a bathroom fan should be left running for at least 20 minutes after a person gets out of the shower. This will ensure that all of the humidity is cleared out of both the room and the ventilation ductwork.Can I use flex duct for bathroom fan?Can Flexible Duct and Air Connector be used for bathroom/shower exhaust fans? Yes. We recommend that you use insulated flex duct in longer vent run applications to assist in keeping the humidity from condensing inside the duct and to help prevent the pooling of water, which can damage the core. Yes.