Distribution boxes, switch boxes should be installed in dry, ventilated and room temperature places; shall not be installed in the role of serious damage to the gas, smoke, vapour, liquid and other harmful media. Selecting between indoor and outdoor distribution boxes starts with the environment and compliance. Indoor units are suited for controlled spaces with low moisture and particulates, often rated IP20–IP40, while outdoor enclosures require IP65–IP68 or NEMA 3R/4/4X ratings to resist rain, dust, and. Indoor and outdoor fiber boxes serve different roles in FTTH, ODN, and enterprise network distribution. Understanding these differences is essential for selecting the right one for your environment.