Air Shower Room Manufacturer

In cleanroom systems, particles carried by personnel and materials are among the largest sources of contamination. Air shower rooms use high-speed clean airflow to remove most loose particles attached to human surfaces and material packaging. The clear conclusion is: A standard air shower operating at 25-30 m/s for 15-30 seconds can reduce particles ≥0.5μm brought in by personnel by more than 95%, making it an indispensable pre-treatment device at the entrance of ISO Class 5 to ISO Class 7 cleanrooms. Its performance directly determines the contamination load on the clean zone. The following provides in-depth technical reference from five dimensions: air shower efficiency, structural parameters, nozzle design, interlock control, and selection要点.

Air Shower Efficiency: Key Performance Indicators and Data

The core performance of an air shower is particle removal efficiency. Industry-recognized key indicators are as follows:

Structural Design: Dimensions, Materials, and Nozzle Layout

The structural design of an air shower directly affects user experience and shower effectiveness. Key design parameters are as follows:

• Overall dimensions: Standard single-person air shower dimensions (W×D×H) are 1200×1000×2100mm, with passage dimensions 800×900×1950mm. Double-person air showers have width 1500-1800mm. For material air showers, depth should be increased to 1500-2000mm;
• Chamber material: Exterior walls use 1.2-1.5mm cold-rolled steel with electrostatic spray coating; interior walls use 1.0-1.2mm stainless steel (304). The ceiling and floor also use stainless steel, with the floor requiring anti-slip embossing (pattern height 0.3-0.5mm);
• Nozzle layout: Single-sided shower is suitable for low-grade cleanrooms (ISO 7-8); double-sided shower is standard, offering about 30% higher efficiency than single-sided; three-sided shower (both sides + top) is suitable for ISO 5-6 high-grade cleanrooms, covering head and shoulder blind spots. Nozzle count: single-person double-sided air showers typically have 6-8 nozzles (3-4 per side);
• Nozzle angle: Nozzles should be adjustable (0-30°), aimed at the standing area. Upper nozzles tilt downward 15-20° for head and shoulder coverage; lower nozzles tilt upward 10-15° for lower leg and foot coverage;
• Floor design: Stainless steel grating or perforated plate with aperture ≤5mm, with a dust collection drawer underneath for regular cleaning of dislodged particles. Grating load capacity should be ≥300 kg/m² to accommodate cart passage.

For high-traffic logistics passages (e.g., materials, equipment entry), a walk-through air shower tunnel (custom length 3-6 meters) is recommended, where personnel complete the shower while walking through, offering higher efficiency and avoiding congestion.

Fan and Filtration System: The Core of Airflow Power and Cleanliness

The fan and filter of an air shower determine shower velocity and air cleanliness. A quantitative comparison is shown below:

Interlock Control and Access Control System

The door control logic of an air shower is a core mechanism for preventing cross-contamination. A complete control system should meet the following requirements:

1. Electronic interlock: The entry and exit doors cannot be opened simultaneously. When one door opens, the other is automatically locked; both doors are locked during the air shower cycle;
2. Air shower logic: Personnel enter → entry door closes → sensor detects personnel (infrared or micro switch) → fan automatically starts → shower timer begins (adjustable 15-99 seconds) → after shower ends, 1-2 second delay → exit door unlocks;
3. Emergency function: In case of power failure or emergency, both doors must be manually openable with opening force ≤67N to meet egress requirements. An emergency stop button should also be provided — when pressed, the fan stops immediately and both doors unlock;
4. Access control integration (optional): Can be integrated with IC card, fingerprint, or facial recognition systems, allowing only authorized personnel to unlock the entry door. The controller should record each shower's time, personnel information, and equipment status;
5. Voice guidance: High-quality air showers should be equipped with a voice guidance system to guide personnel through the shower process (e.g., "Please enter the air shower", "Please raise your arms and turn around", "Shower in progress, do not open the door", etc.).

Interlock system reliability requirements: MTBF ≥50,000 hours, interlock response time ≤0.5 seconds. Interlock function testing is recommended monthly to ensure safety and reliability.

Installation and Maintenance: Key On-Site Points

Proper installation and regular maintenance of air showers are critical for ensuring long-term performance. Key points are as follows:

• On-site installation: The air shower should be installed at the cleanroom entry partition, with gap between chamber and wall panel ≤2mm, filled with neutral sealant. The floor should be level with the ground, levelness deviation ≤2mm/m. Power cables should use flame-retardant cables of at least 3×1.5mm², with a dedicated circuit;
• Filter replacement cycle: Pre-filters (G4 grade) should be cleaned or replaced every 3-6 months; HEPA filters (H13/H14) are generally replaced every 1-2 years based on differential pressure gauge readings. In dusty or heavily polluted environments, replacement cycles should be shortened;
• Daily cleaning: Clean stainless steel interior walls, floor grating, and dust collection drawer daily. The dust collection drawer is recommended for weekly cleaning to avoid particle re-entrainment. Fan inlets should be inspected monthly to remove accumulated dust;
• Velocity and filter leak testing: Measure nozzle exit velocity every six months; if below 20 m/s, check for fan or filter blockage. Perform PAO leak testing annually to ensure HEPA filters are leak-free;
• Common troubleshooting: Fan not running → check power, fuse, overload protection; insufficient velocity → check filter blockage, fan rotation direction; door lock failure → check solenoid coil, magnetic door switch, and control board.

Establishing a quarterly maintenance log recording filter differential pressure, velocity, noise levels, and repair history is a best practice for ensuring long-term stable operation of air showers.

Selection Recommendations: Choosing Air Showers by Cleanliness Class and Application Scenario

The following are selection recommendations for four typical application scenarios: