WhisperGreen Select™ Pick-A-Flow™ Airflow Selector 110, 130 or 150 CFM fan with ECM Motor, <0.3 sone, Select up to 3 Plug 'N Play™ modules. Single-hinged Flex-Z Fast™ installation bracket, 6" duct adaptor, 7-3/8" housing depth. Elegant grille and multi-access junction box.