UV Cabinet

A UV cabinet, also called a UV chamber, is a closed stainless steel cabinet with a germicidal ultraviolet lamp inside. Small items, such as tools, sampling accessories, glassware, garments or components, are placed inside and exposed to UV light for a set time to reduce the number of microbes on their surfaces before they are used or stored.

Germicidal lamps emit UV-C light at around 254 nm, a wavelength that damages the DNA of bacteria, moulds and viruses on the surfaces it reaches. The effect depends on the dose: the strength of the light at the surface multiplied by the exposure time. That is why a timer matters, and why lamps need replacing after their rated hours, since their UV output falls while they still appear to glow normally.

UV has clear limits. It acts only on surfaces in direct line of sight, so shadows, folds, dust and the underside of items receive little or none. It reduces the microbial load on clean surfaces; it does not replace cleaning or sterilisation. Items should go into the cabinet already clean, spread out so the light reaches them. UV-C also harms skin and eyes, so the lamp should run only with the door closed.

Our UV cabinet is built in SS 304, with SS 316 on request, in a mirror finish. It has an integrated UV germicidal lamp, a UV timer control with a digital display, a single shelf and a lockable door with a safety key lock.

In practice a UV cabinet is one step in a routine, not the whole of it. A typical sequence is to clean or wipe the item with an approved disinfectant and let it dry, place it in the cabinet spread out on the shelf, close and lock the door, run the timed cycle, then take the item straight to where it is used or into covered storage. Turning items over between cycles helps reach the surfaces that faced the shelf.

Place the cabinet close to where the treated items will be used, so they are not carried back through less clean areas after treatment. Keep the space around it clear, and make sure there is a power point within reach, without cables trailing across walkways.