Thank you for your question on the model ILF360 in-line exhaust fan. The ILF360 requires the use of eight inch duct work and as long as you are installing at least two grilles on the system, you can use the CVG6 (six inch grille). If you are only installing one grille, you will need to purchase an eight inch ceiling grille from an outside source. Please contact the Technical Service Department at 888-336-6151 if you need further assistance.
Date published: 2016-07-12