Thank you for your question on the model QTXE110FLT exhaust fan/fluorescent light/night light. The QTXE110FLT requires the use of six inch, preferably rigid, duct work. The duct work can be reduced using the model 475, 6" to 4" reducer, but you will decrease the performance and increase the sones. If you have further questions, please contact our Technical Support directly at 800-637-1453. Thanks!
Date published: 2016-02-18