Use the Avantco 17814691 narrow depth side / back grille as a direct replacement for the one that came with your black narrow depth Avantco UBB or UDD refrigeration unit! This grille protects the vital refrigeration components of your equipment, like the condenser coil, from damage that could warrant premature failure and replacement. It also helps to block dust and debris from getting inside the system. Replace a damaged side grille right away to keep your unit running efficiently!