Give the exterior look of your home or building an easy upgrade with an architectural louvered exterior grille. This grille would replace the standard aluminum grille included with your RAB26A sleeve. It is an extruded aluminum grille. It is for use with RAB26A and older sleeves. It is NOT compatible with RAD4A1 and RAD10 EXTERNAL drain kits. Use of this grille would require the use of the internal tube configuration to drain the unit.