Broan 512M Through-Wall Fan, 6-Inch 70 CFM 3.5 Sones N/a Imported Adjustable housings to fit walls from 4-1/2" to 9-1/2" thick and 5-1/4" to 10" thick Built-in damper minimizes backdrafts for energy efficiency Specially designed polymeric fan blade Paintable polymeric grilles