Broan 6 through wall ventilation fan 70 CFM 3.5 Sones. Easy out wall installation a light-skinned inside grille and ventilated out wall cap with constitutional bird screen. 6-Inch diameter supple aluminum epithelial duct. Accommodates walls from 5-1/4 - to 10-Inch. with remotely mounted wall switch or Broan model 57W or 57V. changeable speed -LRB- acquirable separately -RRB-. Wall cap measures 8-Inch.