Why Your Network Rack / Cupboard Needs to Breathe Heat, humidity and dust in a small home or office rack — a plain guide for Mumbai. Part 1 of two. Most people never open the cupboard where the router, switch and UPS live. It hums quietly, the internet works, and that is the end of the conversation. But that little box runs 24 hours a day, every day, and every watt it draws comes back out as heat. In a closed cupboard, that heat has nowhere to go. In Mumbai we have two more p