This duct increaser is designed to fit with Broan’s economy fan duct connector assemblies.It will work with 4” round duct systems, is UL 94 compliant for flammability, and made in the USA.
Specifications
| Brand Name | Broan-Nutone | Item Name | Duct Expander |
| Shape | Round | Color | Black |
| For Use With | 4 in Round Duct Systems | Standards | UL 94 Listed |
| UPC | 026715258055 |
