Thank you for your question on the model AEN110L exhaust fan/LED light. When the wind blows over the outside wall cap or roof cap, where the duct work exits the house, it can cause a negative pressure inside the house causing the back draft damper on the AEN110L to open and close. That is where the noise is coming from. If you install a roof or wall cap with an included back draft damper on it, the problem should be solved. Please contact the Technical Service Department at 888-336-6151 if you need further assistance.
Date published: 2017-05-02