Air Shower for Clean Room

Most contamination in a clean room does not come through the filters. It walks in on people. Hair, skin flakes, lint from clothing and dust from shoes all travel with every person who enters. An air shower for clean room entry is built to deal with exactly this. It is a small enclosed chamber placed between the outside area and the clean room, where strong jets of filtered air remove loose particles from a person before they go in.

How an Air Shower Works

A person steps into the chamber and the first door closes behind them. Fans pull in air, push it through a pre-filter and a HEPA filter, and blow it out of nozzles on the walls or ceiling at high speed, usually 20 to 25 metres per second. The air knocks loose particles off clothing. The dust is then pulled back through return grilles, filtered again and recirculated. After a cycle of around 15 to 30 seconds, the second door unlocks and the person enters the clean room.

The two doors are interlocked, so both can never be open at the same time. This is what keeps the clean room sealed from the outside.

Why a Clean Room Needs One

A clean room is only clean if the people and materials entering it are controlled. A good air shower clean room setup does three things:

• Removes loose dust and fibres from garments before entry
• Acts as an airlock, so outside air does not rush into the clean room
• Reminds staff that they are entering a controlled area, which improves discipline

It does not replace gowning. People still need to wear proper clean room garments. The air shower is the last step, not the only one.

Types of Air Showers

Walk-through air shower. The most common type. One door to enter, one to leave. Suits personnel entry in pharma, electronics and food units.

Cargo air shower. A larger chamber or pass-through for trolleys, boxes and materials. Useful when equipment has to be cleaned before going inside.

Single-person and multi-person units. A single unit suits small labs. Larger plants often use a longer tunnel that takes two or three people at once, so there is no queue at shift change.

Pass box with air shower. A compact unit for small items such as tools and samples.

Where Air Showers Are Used

Pharmaceutical plants, biotech labs, semiconductor and electronics assembly, medical device manufacturing, food and beverage processing, cosmetics, aerospace and precision engineering all use an air shower for clean room entry. The cleaner the required class, the more important this step becomes.

What to Check Before Buying

Build material. Stainless steel interiors are easy to clean and do not shed particles. SS 304 is the usual choice, and SS 316 suits harsher or more corrosive settings.

Filter grade. HEPA filters are standard. Check the efficiency rating and ask how often they need replacing.

Air velocity. Enough air speed matters more than a long cycle. Weak nozzles will not remove particles properly.

Size and capacity. Match the chamber to the number of people entering at peak times. A small unit at a busy entrance creates a queue, and people start skipping the process.

Interlock and controls. Look for reliable door interlocks, a timer you can adjust, indicator lights and an emergency exit function.

Ease of cleaning and service. Smooth walls, rounded corners and easy filter access save hours over the years.

Air Shower Installation Tips

Place the air shower between the gowning room and the clean room entrance, never before the gowning step. Make sure the floor is level and the power supply is stable. Leave space around the unit for filter replacement. The chamber should be sealed properly against the wall panels so there are no air leaks around the frame.

Keeping It Working Well

Clean the interior with a lint-free cloth and a suitable cleaner. Wash or replace pre-filters on schedule, and change HEPA filters when pressure drop or the supplier’s schedule says so. Check the nozzles for blockages, test the interlocks every week and keep a simple log of all service work.

Choosing a Best Supplier

Ask what grade of steel and filter is used, whether the unit can be made to your size, what the lead time is and what spare parts and service support are available. A supplier who asks about your clean room class, headcount and layout before quoting is usually worth more than one who just sends a price.

Cronax Industries manufactures air showers and other contamination control equipment, and can customise the size, number of nozzles and entry type for your facility. If you need a complete entry setup, Cronax Industries also supplies hygiene stations, high speed doors and air curtains, so everything can be planned together.

For product details or a quotation on an air shower for clean room use, you can contact Cronax Industries.