Air Shower
Product Overview
Key Specifications
- Face Velocity
- 20～25 m/s
- Filtration Efficiency
- ≥99.99% for particles ≥0.5μm
- Control
- Shower time adjustable 0–99 s; electronic door interlock
- Power Supply
- 3N 380V 50Hz
Specifications
- Body Material
- 1.2 mm cold-rolled steel with electrostatic powder coating (matte white, flat white, gloss white or orange texture)
- Filtration Efficiency
- ≥99.99% for particles ≥0.5μm
- Face Velocity
- 20～25 m/s
- Power Supply
- 3N 380V 50Hz
- Control
- Shower time adjustable 0–99 s; electronic door interlock
- Door Type
- Stainless steel or aluminum profile; single, double, automatic sliding or high-speed roll-up door
- Standard Dimensions
- Clean zone (W−500) × (D−80) × 2200 mm
Model Reference
| Overall L×W×H (mm) | Nozzles (dual-side) | Power (kW) | Recommended Throughput |
|---|---|---|---|
| W1300×D1000×H2200 | 12 | 0.55 | 1～2 |
| W1300×D1500×H2200 | 18 | 0.75 | 2～4 |
| W1500×D1500×H2200 | 22 | 0.75 | ≥5 |
Detailed Description
The airlock matters more than the dust removal
The most easily overlooked function of an air shower is not dust removal but the airlock. With the two doors electronically interlocked and never open at the same time, there is always an enclosed space between the clean area and the outside, and unfiltered air cannot rush straight into the clean area just because a door is opened. EU GMP Annex 1 (2022) does not require an air shower anywhere in its text; for contamination control of personnel entering clean areas, the emphasis is on the gowning procedure (§7.10) and airlocks (§4.12). In other words, the value of an air shower that holds up from a regulatory standpoint comes mainly from the fact that it is also an interlocked airlock. An air shower whose interlock has been removed, or is routinely skipped with a bypass key, amounts to a hole in the cleanroom wall; the interlock must be enforced by hardware, not by rules.What showering can and cannot do
Showering deals with loose particles clinging to the outer surface of the cleanroom garment, such as fibers and settled dust picked up in the changing room and corridors. It will not make an improperly worn cleanroom garment clean, nor can it control the particles that keep escaping from garment openings after the person has entered — that depends on the garment itself and on the gowning procedure. The dust-removal effect of air showers is not uncontroversial among researchers: according to published reports, in an experiment by Whyte in 1994 there was no significant difference in particle shedding after entering the cleanroom between people who passed through an air shower and people who did not. In practice, the more reasonable role for an air shower is an airlock plus a surface cleaning step, not a purification device that replaces the gowning procedure.How to set air velocity and shower time
A nozzle outlet velocity of 20–25 m/s provides enough shear to strip clinging particles from garment surfaces without making people unsteady on their feet. China's JG/T 296-2010 (Air Shower) specifies a minimum average air velocity according to nozzle type; the 20–25 m/s common in commercial units is an industry convention, not a figure from the clauses of the standard. The shower time is adjustable from 0–99 s, and commercial units are mostly preset at the factory to 10–15 s. Too short a time does not reach the whole body, while too long a time causes queues at the entrance at peak hours; both doors are locked during the shower, and people should turn around during this period so that the nozzles on both sides reach the front and back.Dimensions and throughput
The external dimensions, number of nozzles and recommended number of people for the three standard enclosures are given in the specification table above; the number of nozzles increases with enclosure size. Before selecting, calculate the peak: each cycle of a single air shower includes opening the door, entering, closing the door, showering, opening the door and leaving, and if a whole shift must enter within a fixed time window, the number of cycles multiplied by the number of people per cycle must be sufficient. When throughput exceeds what a single unit can handle, the correct approach is to switch to a multi-person air shower tunnel or install several units in parallel, not to shorten the shower time — shortening the time just means nobody is showered properly.Custom forms to suit site requirements
Beyond the standard enclosures, the following forms can all be custom-built to suit site conditions, with specifications provided on request according to requirements:| Form | Problem it solves | Please provide when requesting a quote |
|---|---|---|
| Revolving door | Continuous flow of people without stopping; the door-leaf geometry guarantees the two sides are never connected | Peak number of people, clear width of the entrance, whether materials pass through as well |
| DC fan | Speed control or reduced load in standby is needed | Daily hours of use, power supply conditions |
| Disinfectant misting | A misting treatment in addition to the shower | Disinfectant to be used, whether compressed air is available, enclosure material requirements |
| L / T-shaped corner | Entrance and exit are not in a straight line, or flows must be separated | Floor plan, swing direction of each door |
| Automatic door | Personnel do not touch door handles | Door type (swing or sliding), sensing method |
| Multi-person tunnel | Peak throughput exceeds what a single unit can handle | Number of people per shift, entry time window, available length |
| Cargo air shower | Trolleys, pallets and other materials going in and out | Actual outer dimensions and height of the handling equipment |
Frequently Asked Questions
Is an air shower mandatory under GMP?
No. EU GMP Annex 1 (2022) does not require an air shower anywhere in its text; contamination control of personnel entering clean areas focuses on the gowning procedure (§7.10) and airlocks (§4.12). The two doors of an air shower are electronically interlocked and never open at the same time, so the unit itself is an airlock — this is its most defensible function; the shower is an additional surface cleaning step. Whether to install one is usually decided by in-house standards or customer requirements, and once installed, the interlock must never be bypassed.
How many seconds should the shower time be set to?
This unit can be adjusted between 0–99 s, and commercial units are mostly preset at the factory to 10–15 s. Consider two things together when setting it: the time must be long enough for a person to turn a full circle during the shower so the nozzles on both sides reach front and back; and at peak hours every extra 1 second accumulates into a queue. If the entrance starts backing up after the time is lengthened, throughput has exceeded what a single unit can handle, and you should switch to a multi-person tunnel or parallel units instead of shortening the time again.
Are there off-the-shelf specifications for revolving-door, DC-fan or disinfectant-misting air showers?
All three are custom-built to suit site conditions, and there is no fixed model table. When requesting a quote, please provide: for a revolving door, the peak number of people and the clear width of the entrance; for a DC fan, the daily hours of use and the power supply; for disinfectant misting, the disinfectant to be used and whether compressed air is available, because the disinfectant determines whether the enclosure needs to be changed to stainless steel. Other conditions (cleanliness class, door swing, floor layout) are the same as for a standard air shower.
Selection References
Before ordering, verify the efficiency grade, media type, and whether the operating environment fits your requirements.
