By the SightShield team · · 3 min read
Why use a rack at all?
A rack keeps the router, firewall, switches, NVR, patch panels and UPS in one locked, ventilated, tidy place. It protects equipment from dust, pests and curious hands, and it makes faults quick to trace. Even a small home with CCTV and Wi-Fi benefits from a 6U or 9U wall rack instead of equipment piled on a shelf.
What “U” means
Racks are 19 inches wide inside, and their height is measured in rack units (U). One U is 1.75 inches (44.45 mm). A typical 24-port switch or patch panel is 1U; an NVR is 1U or 2U; a rack-mount UPS is usually 2U or more. Add up the equipment, then add at least 30–50% for cable managers, airflow and growth.
Common sizes
| Size | Type | Typical use |
|---|---|---|
| 6U–9U | Wall-mount | Homes, villas, small shops: router, PoE switch, patch panel, NVR |
| 12U–15U | Wall-mount | Small offices, clinics, apartment CCTV |
| 18U–27U | Floor-standing | Offices with 50–150 points, factory main rack |
| 36U–42U | Floor-standing | Server rooms, large offices, data rooms |
Depth matters
Wall racks are commonly 450–600 mm deep; floor racks 600, 800 or 1000 mm. Check the depth of your NVR, UPS and any servers before ordering — a deep UPS will not fit a shallow wall rack. Allow room behind equipment for power cables and airflow.
Example rack for a 30-person office
Total about 15–18U: a 18U or 22U rack leaves sensible room for growth.
| Item | Space |
|---|---|
| 48-port patch panel | 2U |
| Cable managers | 2U |
| 48-port PoE switch | 1U |
| Firewall | 1U |
| NVR | 1–2U |
| Shelf for ISP equipment | 2U |
| Rack-mount UPS | 2U |
| Spare space for growth | 4–6U |
Cooling and placement
- Do not put a rack in a closed cupboard, under a staircase or in a bathroom-adjacent shaft without ventilation.
- Fans in the rack roof help small racks; server rooms need dedicated air-conditioning.
- Keep it away from water lines, roof leaks and direct sunlight.
- Choose a spot with a short path to the ISP entry point and the cable routes.
- Lockable doors with a glass or perforated front let you see status lights without opening the rack.
Power and earthing
Every rack needs a power distribution unit (PDU) fed from a UPS, so a power cut does not take down the internet, Wi-Fi and CCTV recording at once. Size the UPS for the total load — PoE switches powering many cameras draw more than people expect. The rack should be bonded to a proper earth, and incoming copper lines from outdoor cameras benefit from surge protection.
UPS Sizing for Office IT and Network Racks →A tidy layout
- Patch panel at the top, switch directly below, with a horizontal cable manager between them.
- Router and firewall next, then the NVR.
- UPS at the bottom, because it is heavy.
- Short patch cords, colour-coded by system, labelled at both ends.
- A printed port schedule kept inside the rack door.
Quick answers
What size rack does a home need?+
Usually a 6U or 9U wall rack: router, PoE switch, patch panel, NVR and a small UPS. Add space if you plan home automation hubs.
Can the NVR go in the network rack?+
Yes, and it should. The NVR then shares the rack’s UPS, lock and ventilation.
Does a rack need air-conditioning?+
Small wall racks with fans in a ventilated space usually do not. Racks with servers or many PoE devices, or in a closed room, do.
Do you supply and install racks?+
Yes. We supply the rack, dress the cabling, label every port and hand over the documentation.
Wall-mount or floor rack for an office?+
Up to around 12–15U of equipment, wall-mount racks save floor space. Beyond that, or with servers and a large UPS, use a floor-standing rack.
Should the rack be locked?+
Yes. A locked rack prevents tampering with the network, CCTV recorder and power.