VES 20" Exhaust Shutter Fan With 9' cord, Wall Mount 5,625/1970 CFM (High/Low at .10 sp) Rough Opening: 24.5" x 24.5" (outer flange of the fan is larger to attach to the wall) Industrial Grade Exhaust Fan OSHA Compliant on Intake side, must be mounted 7' or higher on exhaust side Ready to Install