A monoblock packs the whole refrigeration system into one casing. Part of the unit sits inside the cold room, where it blows cold air, and part sits outside, where it rejects heat. It mounts through an opening cut in the cold room wall or roof, so there is no field piping and no refrigerant to charge on site.
This makes monoblocks quick to install, easy to replace and a common choice for small to medium cold rooms. The trade-off is that the heat-rejecting side sits right next to the cold room, so the space around it must be ventilated; if the room sits in a closed storeroom or kitchen, that heat stays there. Noise is also closer to working areas than with a remote system.
A pharmacy distributor in Lucknow with a small chilled store might fit a monoblock to a prefabricated cold room inside its warehouse, with ventilation planned so heat from the unit does not build up in the dry storage area beside it.