Condensation in the duct. You may find dripping water during or shortly 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. Regarding this, why is my bathroom fan leaking water? The cause of condensation Moist indoor air condenses inside a cold, uninsulated duct and water runs down into the fan. 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.Beside above, 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. In respect to this, why is water dripping from my ceiling fan? Most people believe this is from leaks in their roof but this is usually not the case. What happens is the warm air inside the home is usually quite humid. When this moist warm air is pulled into the cold attic space it will turn to frost inside the vent piping.How do you seal a bathroom fan?Seal holes in the fan housing with caulk, sealing putty, or metal tape. Install the fan then seal around the fan with caulk or canned spray foam. Seal the exhaust duct to the fan box with approved metal tape or mastic. Seal around the exterior fan duct vent with caulk or a pre-made exterior wall gasket.

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