These grey powder-coated steel battery enclosures with locking doors are ETL Listed for indoor use in the U.S. and Canada. They are designed for use with sealed batteries. The MNBE-A ships by UPS, but all other sizes ship by truck freight. All are shipped unassembled. Choose the proper sized enclosure for the size and number of batteries that you need. Use multiple enclosures, side-by-side, for larger battery banks. The MNBE-A and MNBE-B enclosures can be stacked two high. The MNBE-D3R is an aluminum outdoor enclosure which is identical to the MNBE-D.