Retrofitting to an Ultra Silent fan has never been easier. The QTRE080R Ultra Silent Retrofit Fan means upgrading bath ventilation doesn't have to mean upsetting everything. Broan makes it easy with the new QTRE080R Retrofit Fan. With a telescoping frame and a unique duct attachment system, installation is simplified. The fan goes in faster, connects to joists more solidly, and eliminates unprofessional 'rigging.' There's also no patching, priming or painting when you're done. That's what the Broan QTRE080R Retrofit Fan does for you. Grille dimensions: Length: 13 in. - Width: 14 in.