I. Standard Type Clean Transfer Cabinet Installation Plan (General Version) 1. Pre-installation Preparation Confirm the thickness of the wall, the cleanliness level of the area, and the opening dimensions. Reserve power interface (220V/50Hz) in advance. Check the appearance of the equipment and its accessories (sealing strips, ultraviolet lamps, interlock devices, fasteners) to ensure they are complete and in good condition. Clean the installation area to prevent dust and debris from entering the clean area. 2. Wall Hole Opening and Positioning The opening size should be 10-20mm larger than the outline of the transfer window to facilitate adjustment and sealing. Ensure the transfer window is installed horizontally and vertically to prevent deformation and poor sealing. After the box is embedded in the wall, fix it firmly with expansion bolts without any shaking. 3. Sealing Construction (Key Anti-Pollution) Use clean sealing glue to seal the gaps between the box and the wall as a whole. There should be no holes or cracks. The sealing strip of the door frame should be flat and in close contact. There should be no light leakage or air leakage after closing the door. After sealing all the gaps, conduct soap bubble leak detection / visual inspection

The application scenarios of paper frame high-efficiency filters in the automotive manufacturing industry revolve around “ensuring production accuracy, improving product quality, and safeguarding the working environment”. Based on the specific requirements of each core process in automotive manufacturing, the details are as follows: 1. Body painting workshop (core application scenario) Painting is one of the processes with the highest cleanliness requirements in automotive manufacturing. Paper frame high-efficiency filters are mainly installed in the dust-free spray booths, drying rooms, ventilation systems, and end air supply areas of the painting workshop. They use H13-H14 level high-efficiency filtration specifications, mainly filtering dust, particles, fibers, and other impurities in the air that are 0.3μm and below, to prevent them from adhering to the vehicle body surface and avoiding problems such as run-off, pinholes, and particle defects after painting, ensuring the smooth and uniform paint surface of the vehicle and meeting the appearance and anti-corrosion standards of automotive painting. They are also suitable for the high-temperature and slightly corrosive environment of the painting workshop, and some use waterproof and oil-resistant paper frames to extend their service life. 2. Precision processing workshop for automotive components The processing of core automotive components (such as engine blocks, transmissions,

To determine whether the washable air filter of the sub-frame needs cleaning, the core lies in the three dimensions of “appearance observation, operating status, and usage period”. Combined with the structural characteristics and usage scenarios of the filter, the following six intuitive methods can be used for judgment. The operation is simple and no professional tools are required, and it is suitable for various scenarios such as home and commercial use. 1. Visual inspection of the filter material (the most direct and commonly used method): 1. Observe the surface of the filter material: Turn off the power of the equipment, remove the sub-frame and take out the filter material. Observe the surface of the filter material. If the surface of the filter material is covered with obvious dust, hair, or flocculent substances, or there are gray-black stains or slight oil stains attached, and the visible dust thickness exceeds 0.5mm, it indicates that the filter has reached the cleaning standard and needs to be cleaned in time. 2. Inspection of the sub-frame and mother-frame structure: Check the gap of the sub-frame and the buckle area. If there is obvious dust accumulation, or even dust lumps and unpleasant odors, not only the

The normal service life of each filter (in a regular environment) 1. Primary filter (coarse filter) Purpose: To intercept hair, large dust, and clumps Can be washed and reused Normal lifespan: 3 to 6 months Severe clogging, deformation after cleaning, air leakage → Replace earlier 2. HEPA high-efficiency filter (core filter) Purpose: PM2.5, dust, aerosols, bacterial carriers Not washable, must be replaced when expired For home / office: 6 to 12 months For hospitals / clean rooms / crowded places: 3 to 6 months In heavy smog and with large dust levels: 1 to 3 months 3. Activated carbon filter (odor removal / formaldehyde removal) Purpose: Formaldehyde, odor, VOC, cooking fumes Adsorption saturation leads to failure, not renewable In regular environment: 3 to 6 months In newly renovated areas, with strong odor, in smoking environments: 1 to 2 months 4. Composite filter (HEPA + activated carbon integrated) Commonly used in home all-in-one machines Lifespan: 6 to 12 months In heavily polluted environments: 3 to 6 months The key factors affecting lifespan (very important) Usage duration: 8 hours per day vs 24-hour operation, lifespan differs by 2 to 3 times Environmental cleanliness: Clean workshops, hospitals, renovated rooms → Lifespan significantly shortened

Tools Required for Installing High-Efficiency Air Filters in the Supply Air Ceiling I. Basic Installation Tools Cross/flat-head screwdrivers Socket wrenches, adjustable wrenches Hex wrenches (commonly 4mm, 5mm) Rubber mallet (for gentle tapping to position, without damaging the filter frame) Measuring tape, level (for checking installation level) Scissors, utility knife (for cutting sealant strips and protective films) II. Sealing and Cleaning Tools Neutral silicone sealant, sealant gun Lint-free cloth, lint-free wiping cloth 75% medical alcohol / cleanroom-specific cleaner Handheld vacuum cleaner (industrial grade / cleanroom type， for cleaning floating dust in the static pressure box) Disposable PE gloves， clean gloves (strictly prohibit touching the filter material with bare hands) III. Leak Detection and Testing Tools (GMP / Operating Room Essential) PAO aerosol generator Aerosol photometer (leak detector) Pressure gauge / pressure indicator (to measure initial resistance) Wind speed meter / thermal sensitive wind speed meter (to measure air supply uniformity) Particle counter (for cleanliness verification， optional) IV. Safety and Auxiliary Tools Ladder / mobile scaffolding Flashlight， headlamp (for lighting inside the static pressure box) Lashing straps， electrical tape (for organizing cables) Warning tapes, equipment identification plates (maintenance tags) Marker pen， label paper (for recording filter serial number， initial resistance) V. Minimalist

I. Daily Inspection (Per Shift / Daily) Observe the air outlet Check for uneven airflow, vibration, or abnormal noise Look for discoloration, accumulated dust, or mold spots Check the pressure difference Record the current pressure difference of the high-efficiency filter If the pressure difference suddenly increases rapidly, it indicates that the front-end filter has failed or is clogged Prohibited Actions It is strictly forbidden to have dust, unpacking, sanding, or spraying large amounts of disinfectant under the high-efficiency air outlet It is strictly prohibited to poke, scrape, or collide with the uniforming plate of the air outlet II. Weekly Maintenance Surface Cleaning Use a lint-free cloth and 75% alcohol to gently wipe the uniforming plate and frame Do not use hard brushes, high-pressure air, or strong acids and alkalis Check the seal. Check if the filter strips and rubber seals are loose, cracked or have peeled off. Tighten loose screws (uniformly and evenly in opposite directions). Archive the pressure difference records. Form fixed records to facilitate the judgment of the blockage trend. III. Monthly Maintenance Pressure difference analysis Compare with the initial pressure difference If it rises by more than 50%, it requires special attention Check the surrounding of the

Replacement cycle for high-efficiency filters (HEPA) Regular cleanroom (D grade / C grade): 1 to 3 years Critical clean areas (B grade / A grade): 1 to 2 years High environmental dust and poor front-end filtration: 6 to 12 months The 3 decisive factors that truly determine whether to replace (more accurate than time) Resistance reaches the final resistance of the new filter resistance × 2 or reaches the manufacturer’s specified final resistance (generally 400–450 Pa) → Must replace. Leak detection failure PAO leak detection test: Dust is emitted upstream and leakage is detected downstream → Must replace. When the service life reaches the upper limit, even if the resistance is not high and it does not look dirty, it is generally not recommended to exceed 3 years (filter paper will age, sealant will crack, and sealing will fail). Here is a concise version that can be directly written into the record Primary efficiency: 1–3 months Intermediate efficiency: 3–6 months High efficiency: 1–3 years (judged by resistance + leak detection + service life in combination)

The application scenarios of paper frame high-efficiency filters in the automotive manufacturing industry revolve around “ensuring production accuracy, enhancing product quality, and safeguarding the working environment”. Based on the specific requirements of each core process in automotive manufacturing, the details are as follows: 1. Body painting workshop (core application scenario) Painting is one of the processes with the highest cleanliness requirements in automotive manufacturing. Paper frame high-efficiency filters are mainly installed in the dust-free spray booths, drying rooms, ventilation systems, and end air supply areas of the painting workshop. They use H13-H14 level high-efficiency filtration specifications, mainly filtering dust, particles, fibers, and other impurities in the air that are 0.3μm and below, to prevent them from adhering to the vehicle body surface and avoiding problems such as run-off, pinholes, and particle defects after painting, ensuring the smooth and uniform paint surface and meeting the appearance and anti-corrosion standards of automotive painting. They are also suitable for the high-temperature and slightly corrosive environment of the painting workshop, and some use waterproof and oil-resistant paper frames to extend their service life. 2. Precision processing workshop for automotive components The processing of core automotive components (such as engine blocks, transmissions, braking systems, electronic

How to Ensure the Authenticity of Daily Maintenance Records for Air Supply Ceilings 1. Focus on the Core: The 3 Immutable Rules of GMP for “Authenticity” The record must be consistent with the actual operation – If not done, do not write; if done, write it. The record must be filled out immediately upon occurrence – No backdating, no filling in later, no fabrication. Who operated, who recorded, who signed – No proxy signatures, no unauthorized signatures. 2. 7 Practical Measures to Ensure Authenticity 1. Must be recorded immediately on-site Measure pressure difference → Record immediately Cleaning completed → Record immediately Check completed → Sign immediately Prohibited: Finish and then fill in uniformly, fill in at the office later, fabricate 2. Prohibit proxy filling, proxy signing, proxy copying Who performs the maintenance, who fills in with their own hand / personal account Signature must be the person’s own Prohibited: “Help me sign” “Shift leader signs uniformly” 3. Prohibit pre-writing, post-filling, batch fabrication Do not allow writing records for several days in a row Do not allow completing all records at the end of the month If there is a missed record, only note: “Did not record in time, have verified

I. First, ensure the completeness: The record must fully include the 6 types of content (missing any one makes it incomplete) Basic information is complete Equipment name, position number, location of the clean area, grade (A/B/C/D) Date, start/end time Operator, reviewer Maintenance items are complete Fan operating status (abnormal noise, vibration, temperature) Dampers cleaning, installation, sealing Initial/middle/high efficiency filter pressure difference Filter appearance, leakage, sealing condition Exhaust ceiling frame, ceiling sealing Data record is complete Pressure difference: initial, current, final resistance judgment Instrumentation number, calibration validity period Data comparison before and after maintenance Abnormal situations are complete Are there any abnormalities? Abnormal description Initial cause judgment Treatment measures Verification and closed-loop completeness Re-measurement data after treatment Has it returned to normal? Has deviation/change been opened? Signature and review completeness Operator’s signature Reviewer’s signature Auditor’s signature II. Ensure the completeness of 5 execution methods (directly follow the on-site procedures) 1. Use standardized, check-mark style templates, no freehand writing allowed All items should be fixed as check marks + fill-in, do not just write “normal”. The template should indicate: This item is mandatory, cannot be blank. One page covers all content to avoid scattered and lost pages. 2. Execute “Do one, record

Main structure installation steps of the clean room (general standard version) I. Preparations Site cleaning: The ground should be clean, free of debris and water accumulation. Laying out and positioning: Use a tachymeter / laser level to mark the positions of the columns. Determine the length and width of the clean room, the direction of entry and exit, and the layout of the FFU. Material inspection: All the materials, such as profiles, angle pieces, screws, anchor bolts, and expansion bolts, should be complete and undamaged. II. Formal installation steps 1. Install the anchor base Drill holes at the marked points of the columns → Insert expansion bolts → Fix the anchor base. Level the base to ensure that all bases are of the same height and level. 2. Assemble the bottom frame Connect the bottom cross and longitudinal aluminum profiles with angle pieces. Place it on the anchor base, initially lock it, do not tighten it completely, to facilitate subsequent adjustments. Use a laser level to check: Square (equal diagonals) Level (uniform height around) 3. Install the columns Connect the columns with the corner pieces of the bottom frame, stand them vertically. Check the verticality with a level, deviation ≤

Here is a set of general, standardized, and directly applicable installation steps for ultra-clean workbench high-efficiency filters, suitable for both horizontal flow and vertical duct systems, applicable to pharmaceutical factories and laboratories. Installation Steps for Ultra-Clean Workbench High-Efficiency Filters I. Preparation Turn off the power of the ultra-clean workbench and unplug the plug. Prepare the new high-efficiency filter: Check the size, rated air volume, efficiency grade (H13/H14), and inspect for no damage or deformation. Prepare tools: Phillips screwdriver, clean dust-free cloth, 75% ethanol, sealing rubber strips (if aging, consider replacing them together). Clean the operation area to reduce dust. II. Disassembly of the Old High-Efficiency Filter Open the rear/top access cover or outlet decoration cover of the ultra-clean workbench. Loosen the fixing strips/screws of the high-efficiency filter (it is recommended to loosen diagonally to avoid deformation). Gently remove the old high-efficiency filter, do not hit it hard to prevent secondary dust contamination. Wet the inside of the box, the air duct, the sealing groove, and the strips with 75% ethanol, and thoroughly clean. III. Installation of the New High-Efficiency Filter Confirm the air flow direction: The arrow on the outer frame of the filter must point to the outflow side