The vessel frame high-efficiency filtration unit is mainly used for air filtration in clean rooms, laminar flow areas, and at the end of purification equipment. The core maintenance focuses on seal checks, pressure difference monitoring, cleaning protection, replacement cycle, and maintenance of the vessel frame structure, to ensure filtration efficiency and stable airflow. The following are the standardized maintenance steps: 1. Daily inspection (daily / weekly) Pressure difference monitoring Check the pressure difference gauge of the high-efficiency unit and record the initial resistance: Generally, the initial resistance of a high-efficiency unit is 180-220 Pa. When the pressure reaches twice the initial resistance or reaches the upper limit specified by the manufacturer, the filter element must be replaced. Visual inspection Observation of the filter element for any damage, frame leakage, blackening, dust accumulation, moisture absorption, mold formation; Check the **frame (support framework)** for deformation, loosening, rusting, and weld seam cracking. Sealing inspection Check if the filter element and the frame, as well as the frame edge sealing strip, have fallen off, cracked, hardened, or have any air leakage gaps. Air leakage will directly damage the cleanliness level. Operation status Check if the unit’s air outlet is uniform, if there are any

Summary: This sterilization method has a high sterilization grade, can kill spores, and achieves a sterile level, fully meeting the GMP sterile zone requirements. It is currently the most mainstream low-temperature gas sterilization method for clean rooms. The following will explain it in detail from core sterilization capabilities (actual effects), comparison, advantages and disadvantages, and compliance. 1. Core sterilization capability (actual effect) Extremely wide sterilization spectrum It can inactivate bacteria, fungi, viruses, mycoplasma, and the most difficult-to-kill bacterial spores. The kill rate of Bacillus subtilis var. niger spores (ATCC9372, sterilization verification standard strain) is ≥ 6log, i.e., 99.9999%. Low-temperature sterilization without high-temperature damage The sterilization temperature is generally 22–28℃, capable of sterilizing plastics, electronic components, paper packaging materials, culture media, and precision equipment, without deformation or aging. Good gas permeability The vaporized H₂O₂ is gaseous and can penetrate gaps, threads, blind holes, and packaging interiors, more thorough than ultraviolet or alcohol wiping. No residual risk The decomposition products are water + oxygen, with no chemical residues after ventilation and residue removal, and no contamination of drugs or materials. 2. Comparison with other sterilization methods Compared with ultraviolet transfer cabinets Ultraviolet can only reach the surface, and dead corners are ineffective,

Box-type filters (also known as box-type high-efficiency / medium-efficiency filters, plate-type box filters) mainly utilize the interception, adsorption, diffusion, and electrostatic effects of the filter medium to block dust and particles in the air onto the surface or inside the filter material, thereby outputting clean air. The overall structure consists of a box body, filter material (non-woven fabric, glass fiber filter paper, PTFE membrane, etc.), guard net, and sealing rubber strip. The airflow passes through the box body in a straight line to complete the filtration. I. Basic Structure It mainly consists of: metal outer frame box body, filter material (non-woven fabric, glass fiber filter paper, PTFE membrane, etc.), guard net, and sealing rubber strip. It is made into a square box body shape, which is convenient for installation in air conditioning units, fresh air cabinets, and purification equipment. II. Core Filtration Principles (4 Functions) Inertial collision: Large particles of dust move with the airflow and cannot turn when encountering fibers, directly colliding with the fibers and being retained. Mainly filters dust particles larger than 1 μm. Interception effect: Medium-sized particles are close to the fibers and are directly caught and blocked by the fibers, achieving physical interception. Brown diffusion:

Box-type filters (generally referring to medium-efficiency or high-efficiency box-type, with square box structure) mainly compare with plate-type, bag-type, and non-grid high-efficiency filters. Below, the advantages and disadvantages are summarized from a common and engineering perspective to facilitate your selection. 1. Advantages of box-type filters Sturdy structure, strong resistance to pressure Metal box + internal reinforcement, capable of withstanding high air volume and high pressure difference, less prone to deformation and air leakage, suitable for installation in air conditioning units, air handling units, and clean air conditioning systems. Good sealing performance, low air leakage rate Built-in box + sealing rubber strips, simple installation, compared to ordinary plate-type, the sealing is more reliable, suitable for occasions with high cleanliness requirements. Greater dust holding capacity than plate-type, longer service life Internal filter materials are folded / thickened, capable of strong dust accumulation, longer replacement cycle compared to thin plate-type filters, lower maintenance frequency. Easy installation, universal applicability Standard size, can be directly replaced with bag-type or plate-type, suitable for most fresh air cabinets, air conditioning boxes, and combined air conditioning units. Good temperature and humidity resistance Metal frame, suitable for humid, slightly corrosive, and high-temperature working conditions, better than bag-type in terms of

Criteria for Judging the Replacement of High-Efficiency Filters (General for Clean Rooms, Simple and Direct) There is no need to memorize the years. Instead, focus on checking the pressure difference, leak detection, cleanliness, and appearance. Any one of these conditions being met requires replacement. 1. The most standard: Check the pressure difference (most commonly used and most accurate) Record the initial resistance (the pressure difference after the new filter is installed and stabilized) When the final resistance ≥ 2 times the initial resistance → Replace immediately Example: The initial pressure difference is 100 Pa, and it should be replaced when it reaches 200 Pa This standard is strictly followed in DOP supply air outlets, liquid tanks, and GMP workshops. An increase in pressure = accumulation of dust and blockage, decreased air volume, and deteriorated cleanliness 2. Insufficient leak detection (priority for DOP supply air outlets) Use PAO/DOP leak detection scanning: Filter body leakage, frame sealing leakage, liquid tank sealing failure Insufficient leak detection → Replace immediately, cannot continue to use 3. Exceeding cleanliness / dust particle standards Daily inspection in the workshop: Suspension particles, microorganisms exceed standards After excluding problems with the fan, duct, and return air, it is the

Explosion-proof FFU Filter Replacement Judgment Method (Practical Version, General for Explosion-proof Clean Rooms) Core Principle: Prioritize checking the pressure difference, followed by time, air flow, and environment. It is strictly prohibited to operate with the filter blocked in explosion-proof environments. 1. The Most Standard Method: Pressure Difference Method (Most Accurate, Must Be Used) FFU comes with a pressure difference gauge / external pressure difference meter. Measure the pressure difference before and after the filter. Initial resistance of new high-efficiency filter: 120–180 Pa When the pressure difference reaches 300–350 Pa → Must be replaced In lithium battery, chemical explosion-proof workshops, it is recommended to replace when the pressure difference reaches 280 Pa to prevent overload and overheating of the motor and the generation of ignition sources (Key points of explosion-proof) In explosion-proof areas, it is strictly prohibited to have severe blockage of the filter, increased motor load, and excessive temperature rise, as there is an explosion risk. 2. Time Period Method (Reference when there is no pressure difference gauge) General explosion-proof clean area: 6 months Lithium battery, electrolyte, solvent, dust environment: 3 months Continuous 24-hour operation: 2–3 months 3. Intuitive Visual + Operating State Judgment The air outlet becomes smaller, the

The difference between DOP air supply outlets and ordinary air supply outlets DOP supply air outlet is a high-efficiency filtering supply air outlet equipped with DOP detection and liquid tank sealing. It is used in cleanrooms. Ordinary supply air outlets only serve the function of distributing air and do not have the functions of high-efficiency filtration and leak detection. They are used in ordinary air conditioning environments. 1. Core Definition DOP supply air outlet (liquid tank type high-efficiency supply air outlet): A terminal device integrating static pressure box + liquid tank sealing high-efficiency filter + diffuser plate + DOP detection port. It can perform DOP/PAO leak detection on the filter on-site to ensure no leakage. It is commonly used in high-cleanliness environments such as pharmaceuticals, electronics, and healthcare. Common supply air outlet: Composed only of frame + louvers / diffusers, with a maximum of primary / secondary filters, without high-efficiency filtration, without leak detection ports, and without strict sealing. It is used for comfort air conditioning in offices, shopping malls, residences, etc. II. Key Differences (Item-by-item Comparison) 1. Filtration Capacity DOP Supply Air Outlet: Built-in H14/U15 high-efficiency filter, with a filtration efficiency of ≥ 99.99% for 0.3μm particles, capable of

Service life of high-efficiency filters (general standards for clean rooms) Based on three scenarios: normal operation conditions, harsh conditions, and DOP air supply outlet liquid tank high-efficiency, the industry practical standards are directly provided: 1. Ordinary clean rooms (pharmaceutical / electronic workshops, conventional ventilation) H13/H14 high-efficiency filters: Normal use for 1 to 2 years With intact primary and secondary filters at the front end: Available for 2 to 3 years 2. Poor conditions, high dust, large fresh air volume (Noisecell workshops have a lot of dust production, no good pre-filtering, frequent opening) Service life is significantly shortened: 6 months to 1 year 3. Operating rooms, aseptic GMP workshops, biological laboratories DOP liquid tank high-efficiency air supply outlet filters Recommendation: Replace every 1 year If the pressure difference rises rapidly or the DOP leak test fails: Replace immediately 4. Whether to replace or not is not determined by time， but by 3 indicators Final resistance reaches 2 times the initial resistance (the most standard basis) DOP/PAO leak detection is不合格， there is leakage Cleanliness does not meet standards， dust particle exceeds limits 5. Key to extending service life Ensure primary filters are replaced within 3 to 6 months， secondary filters within 6

A list of all the equipment that can be linked with the explosion-proof FFU intelligent control system Explosion-proof FFU Intelligent Group Control System， supports signal interlock， automatic start-stop， wind speed linkage， and fault linkage with explosion-proof， clean workshop， fire safety， and environmental monitoring equipment. It is compatible with lithium batteries， pharmaceuticals， chemicals， and dust explosion-proof clean workshops. 1. Environmental Detection Type (Most Commonly Used， Must Be Linked) Gas detector (explosion-proof) Hydrogen， electrolyte vapor， ethanol， acetone， VOC gas concentration exceeds standard → Automatically increase FFU wind speed， force ventilation， interlock exhaust， dilute flammable and explosive gases. Dust concentration detector (explosion-proof) Dust concentration exceeds standard → FFU automatically increase air volume to suppress dust cloud aggregation and reduce explosion risk. Temperature and humidity sensor Temperature and humidity exceed standard → Link FFU wind speed adjustment， cooperate with air conditioning to stabilize workshop environment. Differential pressure sensor / Workshop differential pressure monitoring Pressure imbalance between clean area and non-clean area → Link FFU to automatically adjust speed， maintain positive pressure / negative pressure gradient. 2. Fire Safety and Security Type (Compliance with Safety Assessment， Fire Inspection Mandatory Linkage) Smoke detector， temperature detector Fire alarm host， fire control module Fire alarm triggered → According

Anti-explosion FFU Frequency Conversion Speed Control Core Advantages (Easy-to-understand, Engineering Practical Version) 1. Energy saving and electricity consumption reduction, with the most obvious long-term return on investment The ordinary fixed-speed anti-explosion FFU has only one full-speed setting. Regardless of whether the workshop is fully operational or not, it operates at full load, resulting in significant waste. The frequency conversion FFU can adjust speed as needed: Production peak: Medium to high wind speed to meet cleanliness and air change frequency requirements Night shift / standby / low production: Low wind speed to maintain positive pressure only Overall energy saving of 30% to 50%. In a 24-hour continuous operation lithium battery, pharmaceutical, and chemical clean workshops, the electricity saved over 1 to 2 years can cover the difference between frequency conversion and intelligent control. 2. Wind speed stepless adjustment, more stable cleanliness Supports 0-100% stepless speed adjustment and multi-level fine adjustment Can precisely match air volume according to cleanliness level (ISO5/7/8) and room air change frequency Easily maintain the positive pressure gradient in the workshop, stable temperature and humidity, avoiding local vortex and dust accumulation, and higher product yield. 3. Soft start, soft stop, protecting the motor and extending its lifespan Frequency

The working principle of the boat frame high-efficiency filtration unit (assumed to be a modular framework-based high-efficiency filtration equipment) is mainly based on the modular structure to guide the medium (air / fluid) to pass through the high-efficiency filter element in an orderly manner. Through the collaborative action of multiple mechanisms, it can intercept and separate the suspended particles and impurities in the medium. Finally, it outputs clean medium. The overall process can be divided into three core steps: “medium guidance – filter element interception – clean output”. Specifically: Medium guidance stage: The air or fluid to be filtered enters the modular framework of the boat frame high-efficiency filtration unit under the action of external power (such as a fan or pump). The guiding structure inside the framework (such as guide plates and positioning rails) will guide the medium to be evenly distributed, avoiding local excessive or insufficient flow velocity, ensuring that each part of the medium can fully contact the filter element, improving the filtration efficiency, and reducing the resistance during the medium flow process. Filter element core interception stage: This is the core working process of the filtration unit. The filter element (core filtering component) of the appropriate

The vessel frame high-efficiency filtration unit (presumably a common name or variation for “blade frame type” or “mother-child frame type” high-efficiency filtration units) is a modularized high-efficiency air/flow filtration device. Its core function is to remove suspended particles and impurities from the medium, ensuring the cleanliness of the medium. It is widely used in clean environments, industrial fluid treatment, and other scenarios. The core features and related filtering unit characteristics are summarized as follows: Structural design: It adopts a “frame + filter element” modular structure. The frame is mostly made of aluminum alloy, galvanized steel plate, or stainless steel. The filter element can be quickly installed and fixed through plug-in or snap-fit methods. Some models include sealing slots and positioning guides to ensure a tight seal and prevent unfiltered medium from leaking. Filter performance: The core is compatible with HEPA or ULPA grade filter elements, which can precisely intercept particles ranging from 0.1μm to 10μm. It achieves efficient filtration through the combined action of interception, inertial collision, and diffusion effects, in accordance with relevant domestic and international standards such as GB/T 13554-2020. Core advantages: Installation is convenient, maintenance is flexible. There is no need to disassemble the entire equipment. Only