I. Installation Cost: Not Expensive The basic installation cost for a regular goods washing room: several hundred to a few thousand yuan. For a large-scale / automatic door / with conveyor line: a bit more expensive, but still much lower than air conditioners and purification units. Installation conditions are simple A flat ground is sufficient Power connection: 220V / 380V standard electricity No need for complex ductwork or civil engineering renovations Summary: Installation is a small one-time expense. II. Maintenance Cost: Very Low The structure of the goods washing room is simple, with no easily damaged core components. Daily maintenance involves only 3 items: Primary efficiency filter Replace every 3 to 6 months Cost: several tens to over a hundred yuan High efficiency filter Replace every 1 to 2 years Cost: several hundred yuan (standard size) Door seals, door locks, minor maintenance of the fan Replace only once every few years The total cost is very low Annual maintenance cost For a regular goods washing room: only a few hundred to over a thousand yuan, much cheaper than air conditioners, FFU, and clean air conditioning systems. III. The only two factors that truly affect the cost are: Material 201 Stainless

The normal service life of a 304 stainless steel air shower room Normal environment: 8-10 years in dry, clean, low-acid and low-alkali conditions: 10-15 years As long as it is genuine 304 stainless steel and not a counterfeit 201, it is very common to use it for about 10 years. The key factor affecting the lifespan (determining whether you use 8 years or 15 years) Environmental humidity & corrosiveness Dry and dust-free workshop → longest lifespan Food factories, with moisture, disinfectants → slightly shorter, but still much better than 201 Strong acid and strong alkali environment → it is recommended to directly use 316L Stainless steel thickness Regular: 1.0-1.2mm → sufficient Adding 1.5mm or more → more durable, less prone to deformation Daily maintenance Clean regularly, no long-term water accumulation Replace the filter on time → Lifespan directly increases Which components will fail first? (Not the stainless steel itself) The real wear-and-tear parts of the air shower room are these: High-efficiency filter: 1-2 years per replacement Primary filter: 3-6 months per replacement Door gasket, door lock, fan bearing: 3-5 years may require maintenance The stainless steel box itself, basically will not fail So: 304 air shower room = Box lasts

Roll-up style cargo washing rooms are more suitable for large-sized goods, in scenarios with limited space and frequent passage; while automatic sliding door cargo washing rooms have better performance in terms of high cleanliness, sealing, and stability. Here is a detailed comparison: 1. Roll-up style cargo washing room (quick roll-up door) Advantages High space utilization: Vertical lifting, no lateral space occupation, suitable for narrow passageways and goods that are too wide. High passage efficiency: Switching speed is fast (0.8–1.2m/s), 1–2 seconds to complete the lifting, suitable for frequent entry and exit of forklifts / AGVs / large equipment. Good impact resistance: PVC / wear-resistant curtain fabric material, less likely to be damaged by goods, suitable for heavy-load logistics. Low maintenance cost: Simple structure (roller + curtain fabric), few wear parts, easy maintenance. Suitable for large sizes: Can be made as ultra-wide / ultra-high door openings, no risk of cargo blocking. Disadvantages Poor sealing: There are gaps between curtain pieces and at the bottom, the wind leakage rate is higher than that of sliding doors, high cleanliness scenarios require enhanced sealing. High noise: Loud when rapidly lifting. Poor insulation / sound insulation: The curtain fabric is thin, the heat insulation and

1. First, look at the 3 most crucial conditions (determining the type of door) Is the channel width sufficient? Is there space on both sides? → Choose an automatic sliding door (with good sealing and high cleanliness) Is the channel narrow and without side positions? → Must be a rolling shutter door What is the size of the goods? Small carts, pallets → A sliding door is sufficient Extremely wide, extremely tall, for forklifts / AGVs → A rolling shutter door What is the cleanliness level? Class 100 / Class 1000 / strict GMP → Prefer a sliding door Class 10,000 / Class 100,000 / logistics passage → A rolling shutter door is more cost-effective 2. Then determine the type of washroom Single-person single-air shower room: for personnel, not for goods Washroom (double-door interlocked): dedicated for goods Washroom passage: for large-scale continuous cargo passage Corner washroom (L-shaped): limited space, requires turning 3. Match quickly according to the usage scenario Food / Medicine / Electronics high cleanliness Automatic sliding door washroom → Strong sealing, easy cleaning, in line with GMP Warehouse / Logistics / Frequent entry and exit of workshops Rolling shutter door washroom → Resistant to impact, quick opening, no

Installation requirements for the high-efficiency filter of the air shower transfer window The installation position is generally at the top of the air shower transfer window or in the rear blower compartment, located before the blower outlet and the air shower nozzle. → Ensure that the air is filtered first and then blown out from the nozzle. Sealing requirements (most critical) The filter must be sealed tightly all around, without any air leakage or gaps. Common sealing strips / sealing gaskets, pressed tightly without deformation. Side leakage or bypass flow is strictly prohibited. Otherwise, it is equivalent to no filtration. The direction must not be installed reversed. Inlet surface: facing the blower and the duct side Outlet surface: facing the air shower chamber and the nozzle side Most filter materials have arrow markings indicating the direction of air flow. The arrow must point downward / towards the outlet. Installation must be flat and without compression. The frame must not be distorted, squeezed, stepped on, or pressed and collided with the filter paper. Ensure that the frame is evenly stressed to avoid cracking and air leakage. Installation environment requirements Disassemble and assemble in a clean environment to prevent dust from falling

The overall service life of the horizontal flow ultra-clean workstation is 5 to 10 years. Core components need to be replaced periodically; proper maintenance can significantly extend the lifespan and ensure cleanliness. 1. Service Life (Whole Machine and Core Components) 1. Whole Machine Service Life Normal conditions: 5–8 years (ordinary laboratories, moderate usage frequency) Good maintenance + clean environment: 8–10 years (even longer) High load / high pollution scenarios: It is recommended to conduct a comprehensive performance assessment every 5 years to determine whether a major repair or replacement is necessary. 2. Core Component Replacement Cycle Component Replacement / Maintenance Cycle Change the basis for judgment Primary filter Weekly cleaning; replace every 3-6 months (for high dust content, replace every 1-3 months) Severe dust accumulation, high resistance, and decreased wind speed High-efficiency particulate air filter (HEPA) 2-3 years (regular); 1-2 years (high load) Wind speed < 0.25m/s, leakage, and non-compliance with cleanliness standards Fan Design life of 5 to 8 years Strange noises, vibrations, and continuous decrease in air volume Ultraviolet lamp 2000 – 3000 hours (approximately 1 year) The brightness has significantly decreased and turned dark. Lighting / Circuit LED lights: 3 – 5 years; Circuit: 5 – 10

I will prepare for you a detailed, step-by-step standard procedure specifically about the replacement of the horizontal flow ultra-clean workbench and the HEPA filter. It is straightforward and can be followed directly. There are no unnecessary details. This procedure can be used as an SOP in both workshops and laboratories. Horizontal flow ultra-clean workbench Detailed steps for HEPA filter replacement 1. Before replacement (must be done first) Confirm that it is a HEPA filter For horizontal flow workbench: The HEPA filter is located at the rear air supply position, not at the return air inlet. It cannot be washed or tapped. It is a one-time consumable. Replacement signal (any one of the following conditions is sufficient) The pressure difference reading significantly increases, exceeding the normal value by more than 30% The wind speed significantly decreases and the cleanliness does not meet the standard It has been in use for 6-12 months (frequent use) The filter is deformed, leaking, or the rubber strip is aging Preparation items Same model new HEPA filter (with certificate of conformity) Cross-head screwdriver Dust-free cloth + 75% alcohol Dust-free gloves, mask, clean suit Seal bag (for old filter) Safety prerequisite Must be powered off! Unplug the

Here is a set of preventive measures for unstable pressure differential readings of the air shower transfer window that can be directly implemented on-site, are simple and easy to remember, and are suitable for training, posting on the wall, and creating an SOP: Unstable pressure differential readings of the pressure differential meter Prevention measures 1. Daily operation prevention (most critical and effective) Do not open both doors simultaneously Always ensure the electronic interlock is normal, prevent direct connection between the clean area and the non-clean area, and avoid chaotic airflow and sudden pressure differences. Close the door tightly After each use, confirm that the door body is completely closed, and the sealing strip is seamlessly attached without any gaps. Do not block the nozzle or the air duct with items Place the transfer materials centrally, do not block the air shower nozzle or the return air filter, to ensure stable airflow. Do not open the door or disturb during the air shower operation Do not touch the door or move items during the air shower, to avoid sudden changes in pressure. 2. Daily maintenance prevention of pressure differential meter and pressure guiding tube Calibrate the zero position once a month

I present you with the most rigorous conclusion that can be directly incorporated into the SOP, and is approved by QA and audits: The correct method for extending the lifespan of the filter does not reduce the filtration effect; instead, it makes the filtration effect more stable and lasting. 1. Why doesn’t it affect? The methods you currently use are essentially: protecting the high-efficiency filter + reducing its burden rather than lowering the filtration standard. These methods only have benefits and no drawbacks for the filtration effect. Replace the primary and intermediate filters on time → Dust is blocked in advance, the high-efficiency filter remains clean, and the filtration efficiency remains at its highest. Control dust, humidity, and do not touch the filter paper → The high-efficiency filter is not dirty, clogged, moldy, or torn, and its performance does not deteriorate. Proper installation and ensuring sealing → No air leakage, no short circuit, and the actual filtration effect is not compromised. Replace in time when the pressure difference increases → Always operating within the optimal working range of the high-efficiency filter, with stable air volume and cleanliness. They do not change the high-efficiency itself; they just keep it in the

I will provide you with the most core, standard, and directly applicable version that can be incorporated into the SOP / training materials – the factors that truly affect the filtration efficiency of the high-efficiency filter, only presenting the key points and omitting the unnecessary details. 1. 7 key factors affecting filtration efficiency 1. The quality of the filter itself (the most fundamental) Insufficient filter material grade (H13/H14 are truly efficient) Filter paper has pinholes, damage, or flaws Poor sealing glue and frame craftsmanship → Directly leads to non-compliance with filtration efficiency standards. 2. Whether the installation seal is intact (extremely influential) Leakage of the frame and sealing strip Improper installation, with gaps Inadequate filling of the liquid tank glue and bubbles → Air passes directly through without filtration, resulting in the failure of the filtration effect. 3. Whether the front-end filtration is normal (primary and secondary efficiency) Long-term failure to replace, blockage, or damage of primary and secondary efficiency filters Large particles of dust directly reach the high-efficiency filter → The high-efficiency filter quickly gets clogged, the resistance rises, the air volume decreases, and the filtration effect deteriorates. 4. Usage time and blockage degree Excessive use Resistance reaching more

Here is a set of maintenance record archiving precautions for clean rooms / GMP / audits that can be directly passed. It is simple, practical, and can be directly posted on the wall for execution: Maintenance Record Archiving Precautions for Supply Air Ceilings – Archive Management Notes 1. Complete Archiving Scope All daily inspections, cleaning, pressure difference monitoring, filter replacement, fault handling, verification records, and audit records must be archived completely. No selective retention is allowed. Supporting materials should also be archived together: equipment ledger, filter certificate, pressure difference meter calibration certificate, maintenance SOP number. 2. Clear Archiving Classification Archive separately by **”Workshop → Area → Equipment Position Number → Year”**. Each machine should have its own file. Do not mix with other equipment. Paper Archives: Establish a directory + page numbers for quick retrieval. Electronic Archives: Store according to a unified naming rule, such as: Supply Air Ceiling – XX Workshop – Position Number – 2026 Annual Maintenance Record 3. Timely Archiving Deadline Principle: Whoever records, whoever organizes, and archive on time. Daily records: Archive once a week/month. Annual archives: Complete binding and archiving within 1 month of the following year. Prohibit long-term storage on-site, scattered storage, loss or

I will provide you with a set of solutions for clean rooms, GMP, customer audits, and on-site implementation, ensuring that the daily maintenance records of the air supply ceiling are 100% genuine, without any falsification, backfilling, or proxy signatures. How to ensure the authenticity of the air supply ceiling maintenance records 1. From the operational perspective: who does it, who records it, and it is recorded on-site It must be recorded in real time on-site Write immediately after measuring the pressure difference, sign immediately after cleaning Prohibited: Finish first, then fill in uniformly, and return to the office to fill in later Prohibited proxy filling, proxy signing, proxy copying Who performs the maintenance, who signs it / fills it in with their account The signature must be the person themselves, and “help me sign” is not allowed Prohibited to write in advance, delay filling in, or produce in batches Any “supplementary records” are regarded as not genuine If there is a missing record, it can only be written as: Not recorded / Rechecked and noted the reason + signature 2. From the data perspective: The data must be reasonable and not abnormal The pressure difference trend must be true Normal: