CEILING OPENING SIZE - Please note the ceiling opening requirement is 12 x 11 1/2 inch, resizing your existing ceiling opening will be needed if existing fan housing is different. EZ INSTALL – Attic access Not required for installation. Designed to fit 12 x 11 1/2 inch ceiling openings in bathrooms. Adjustments to your ceiling opening may be necessary if replacing a differently sized fan. TOP-NOTCH AIRFLOW – With an impressive 150 cubic feet per minute (CFM), this fan efficiently removes moisture, odors, and stale air for bathrooms up to 150 square feet. BUILT-IN LIGHTING - This modern Edge-Lit LED panel delivers 1365 lumens of brightness with just 15 watts of energy. It’s dimmable for customizable ambiance, and the 4000K color temperature ensures a natural, clean light. DUCTING - Removable 6 inch metal duct adapter with back draft prevention damper. RELIABILITY - Proudly stand behind our products.