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Cleanliness Engineering Essentials: Inspection Items, Indicators and Common Nonconformities for Air Shower Rooms
2026/9/1
According to relevant standards and industry practices, the acceptance items, indicators, and common non-conformities of the wind shower room mainly include the following aspects:
01 Core acceptance items and indicators
1. Wind speed and air volume test
Acceptance indicators: The wind speed at the nozzle outlet is the core performance indicator. The mainstream industry standards require the nozzle outlet wind speed to be ≥25m/s, with the basic compliance threshold being ≥21m/s; the internal average wind speed at the personnel station should be ≥18m/s to avoid air blowing dead zones.
Test method: Use instruments such as hot ball-type wind speed meters to measure multiple points at the nozzle front or at the personnel station and take the average value.
2. Door interlock function and response time
Acceptance indicators: The front and rear doors of the wind shower room must achieve electronic interlock, that is, when one door is opened, the other door must be forcibly locked, and it is strictly prohibited to open simultaneously to prevent non-clean air from flowing back.
Test method: Conduct actual door opening and closing tests for interlock response time and door status detection to ensure smooth opening and closing and normal locking.
3. Leak detection and sealing of high-efficiency filters
Acceptance indicators: The high-efficiency filter (HEPA) and its seal with the cabinet must be intact. The filtration efficiency is usually required to reach 99.99% (for particles ≥0.3μm), ensuring that unfiltered air does not leak from the edges. Test method: Conduct on-site PAO/DOP scanning leak detection or use a particle counter to detect the purification effect.
4. Noise measurement
Acceptance indicators: The noise of the wind shower room during operation should be controlled within a reasonable range, typically ≤65dB(A).
Test method: Use a sound level meter to measure at the center of the door in front of the wind shower room, 1000mm outward from the center and 1500mm from the ground.
5. Pressure difference and cleanliness test
Acceptance indicators: The wind shower room and the adjacent clean area should maintain a certain pressure difference (usually ≥5Pa to 15Pa, depending on the cleanliness level). In necessary cases, dust particle counting should be conducted to ensure that the indoor particle concentration meets the requirements of the corresponding cleanliness level.
Test method: Use a pressure difference meter to measure the indoor and outdoor pressure difference; use a particle counter to detect air cleanliness.
6. Electrical safety and grounding check
Acceptance indicators: The electrical system must have protection functions such as leakage, overload, and short circuit; the grounding resistance must comply with safety regulations (usually ≤4Ω).
Test method: Use leakage current measuring instruments, grounding resistance testers, and withstand voltage testers for electrical strength testing.
02 Common non-conformities and causes
During actual acceptance and daily use, the wind shower room often experiences the following non-conformities due to improper installation or maintenance:
Insufficient wind speed or uneven airflow: Usually caused by severe blockage of the filter, failure of the fan, improper design of the duct, or loose internal structure.
Interlock function failure: Control system failure, dust accumulation on sensors (such as infrared sensors), or line short circuit, causing the door to fail to automatically sense or both doors being pulled open simultaneously.
Poor sealing and air leakage: Unsealed joints between the cabinet and the wall, aging and damaged sealing strips at the door gap, or improper sealing treatment of the high-efficiency filter during installation, resulting in the infiltration of external dirty air.
Excessive operating noise: Friction between the fan blades and the casing, loose internal structure of the duct, or severe wear and lack of lubrication of the fan bearings.
Installation position and ground issues: The outlet of the wind shower room is not close to the entrance of the clean area (with an open area in the middle), or the installation ground is not level (tolerance of levelness > 3mm), causing deformation of the door frame and poor sealing.
Filter efficiency decline: Failure to replace the initial or high-efficiency filter at the end of its service life, or incorrect installation sequence, resulting in the air blown out carrying contaminated particles.
