When existing 4" duct cannot be replaced, use the Broan® 6" to 4" duct reducer. Although larger duct diameters are always recommended, this duct reducer will allow you to connect a ventilation fan with a 6" duct connector to existing 4" ducting.

Broan-NuTone® Reducer, 3-1/2 in Length, For Use With: Duct, Polymer, Black, Domestic

• Although larger duct diameters are always recommended, this transition will help when existing 4 in duct cannot be replaced

• Warranty Information https://externalassets.unilogcorp.com/ASSETS/DOCUMENTS/ITEMS/EN/IDW_DOCUMENT_481c96cc1f9d5396f0f2f857255a1689a3645f9ea8f4f3e1c3ce72f7c28689e1.pdf
• Specification Sheet https://externalassets.unilogcorp.com/ASSETS/DOCUMENTS/ITEMS/EN/NuTone_475B_Data_Sheet.pdf