Why Your Bathroom Exhaust Fan is Dripping (and How to Fix It)
A dripping bath exhaust fan is not normal and usually points to a condensation or venting issue. Your exhaust fan is designed to remove moisture, not add more to your bathroom! If you’re dealing with this problem, here’s what could be causing it and how to fix it.
Common Causes of a Dripping Exhaust Fan
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Condensation in the Ductwork:
- Warm, moist air from the bathroom condenses in cold, uninsulated ducts.
- Fix: Add insulation around the ductwork to prevent condensation. Keep the duct runs straight, short, and properly vented to the outside.
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Improper Venting:
- Excessive bends or low spots in the duct trap water, leading to drips or leaks.
- Fix: Re-route the duct to minimize bends and create a slight slope toward the outside vent to let condensation drain out.
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Faulty Damper:
- If the fan or exterior damper is stuck open, warm air can get into the duct and create condensation.
- Fix: Inspect and repair or replace the damper to ensure it opens and closes properly.
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How to Fix and Prevent the Problem
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Inspect and Re-Reroute Ducting:
- Ensure the duct is properly vented outside, without sharp bends or low loops where water can collect.
- Adjust the slope so condensation drains outward.
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Insulate the Ductwork:
- Wrap the duct to reduce temperature differences that cause condensation.
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Check the Damper:
- Make sure both the fan’s damper and the external damper open and close correctly to avoid airflow issues.
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Clean and Maintain:
- Regularly clean ducts and vents to prevent blockages and ensure airflow.
Why Proper Installation Matters
- Poor practices, like creating low loops in the duct, can trap water and lead to dripping or even significant leaks over time.
- Correct routing (short, straight ducts with an outward slope) prevents moisture issues and improves the fan’s efficiency.
Proper insulation, duct routing, and damper operation can solve most dripping exhaust fan problems while preventing future issues.
Key Takeaway about a Dripping Bathroom Exhaust Fan
Dripping fans are usually caused by condensation or poor duct installation. Fixing the duct insulation, slope, or damper can quickly solve the problem—and keep your bathroom dry!