LG AXSVA1 26 Sleeve for Through-The-Wall Air Conditioners, White 26-inch wall sleeve to be used with through-the-wall air conditioners Install wall sleeve in pre-cast concrete or masonary walls - wall sleeve to be securely fastened to wall opening before installing air conditioner as it helps bear the weight of the air conditioner Wall sleeve helps insulate the air conditioner and protects it from dust, bugs and other debris that could get sucked into it All metal construction withstands inclement weather, corrosion and other elements Optional stamped aluminum grille (AXRGALA01) sold separately