The supply air ceiling of the operating room is the core terminal equipment of the air conditioning system in the clean operating room. It achieves a high cleanliness and low bacterial concentration environment in the operating area through reasonable air flow organization and is a key facility to ensure surgical safety. Its application and maintenance must strictly follow the relevant norms of the clean operating department (such as GB 50333-2013 “Technical Code for Hospital Clean Operating Department Buildings”). I. Core Applications of Air Supply Ceilings in Operating Rooms 1. Application scenarios and compatibility levels Supply air ceilings are mainly used in Class I to III clean operating rooms. Different grades of operating rooms have different performance requirements for them Class I (Class 100) operating room: It is suitable for surgeries with extremely high aseptic requirements such as cardiac surgery and neurosurgery. It should adopt a vertical laminar flow type air supply ceiling. The airflow should flow vertically downward at a speed of 0.25 to 0.30m/s, evenly covering the operating table to form a “clean air flow barrier” and isolate surrounding contamination. Class II to III (Class 1,000 to 10,000) operating rooms: Suitable for routine surgeries in orthopedics, general surgery, etc.

To determine whether the high-efficiency filters (HEPA/ULPA) of the supply air ceiling in the operating room need to be replaced, it is necessary to combine three core dimensions: differential pressure monitoring, performance testing, and service life, and at the same time follow the requirements of GB 50333-2013 “Technical Code for Building Clean Operating Rooms in Hospitals”. The specific judgment method is as follows: 1. Differential pressure monitoring (core judgment basis) The resistance of high-efficiency filters will increase with the increase of dust accumulation. The pressure difference is the most direct indicator for judgment. The operation steps are as follows: Record the initial pressure difference After the new filter is installed and the self-cleaning operation meets the standards, record the initial pressure difference before and after the high-efficiency filter. This value will be retained as a reference value. Daily monitoring comparison During normal operation, regularly check the reading of the differential pressure gauge that comes with the supply air ceiling. When the actual pressure difference reaches 1.8 to 2 times the initial pressure difference, replacement should be arranged immediately. If the pressure difference exceeds twice the initial pressure difference and the operation continues, it will cause a sudden drop in the

To extend the service life of high-temperature resistant air filters with separators, the key lies in reducing dust load, controlling operating conditions, and ensuring proper maintenance and protection. Considering its high-temperature resistance and high resistance characteristics, the following targeted measures can be taken: 1. A well-configured pre-filtration system is provided to intercept large particles of dust Selection of staged filtration Before the high-temperature resistant filter, a medium-efficiency filter (F7-F8 grade) or a sub-high-efficiency filter (H10-H11 grade) should be connected in series. It is preferred to use a pre-filter product with the same temperature resistance (such as a medium-efficiency filter made of glass fiber, with a temperature resistance of ≥200℃) to avoid the failure of the pre-filter at high temperatures. Function: It can intercept large particles of dust ≥1μm (accounting for over 80% of the total dust volume), significantly reduce the clogging speed of the filter material of high-temperature resistant filters, and extend their service life by 50% to 100%. Scene adaptation: For environments with high dust concentration such as coating drying rooms and boiler exhaust gas treatment, it is recommended to adopt a “coarse + medium” two-stage pre-filtration. The pre-filter should be replaced regularly Establish a replacement ledger for the

The final resistance standards for different models of high-temperature resistant air filters with separators are not entirely consistent. The numerical differences are determined by three core factors: filter material, structural design, and rated air volume. The specific differences and patterns are as follows: I. Core Influencing Factors of the Differences in Final Resistance Standards The material of the filter material determines the basic resistance range The filter material of high-temperature resistant filters is the core influencing factor of resistance. The pore size and porosity of fibers made of different materials vary, and the reference values of initial resistance and final resistance differ significantly. Glass fiber filter material (temperature resistance 250℃) The fiber diameter is fine (0.5-2μm), with a high porosity. The initial resistance is usually 100-150Pa, and the final resistance is calculated as 2-3 times the initial resistance, corresponding to 200-450Pa. Ceramic fiber filter material (temperature resistance 400-600℃) : The fiber diameter is thick (2-5μm), and the porosity is relatively low. The initial resistance is usually 120-180Pa, and the final resistance corresponds to 240-540Pa. Basalt fiber filter material (temperature resistance above 800℃) The fiber is highly rigid, with a dense pore structure. Its initial resistance can reach 150-200Pa, and the

The replacement cycle of the high-efficiency filters (commonly H13/H14 grades) in the automatic double-door material shower room should be comprehensively judged based on the usage environment, pressure difference changes, and filtration efficiency. The core reference standards are as follows: I. Regular Replacement Cycle (Basic Reference) Standard usage scenarios (entrance of clean areas, low dust concentration, daily usage duration 8-12 hours, such as electronic and pharmaceutical clean workshops) : 1-2 years. High-dust scenarios (areas with large amounts of dust such as chemical engineering, building materials, and mechanical processing, or where the material shower is used for more than 16 hours a day) : 6 to 12 months. For special clean requirement scenarios (such as biosafety laboratories, aseptic pharmaceutical workshops, etc., where particulate matter control is extremely strict) : The longest period shall not exceed 18 months, or the cycle shall be shortened in accordance with industry standards. Ii. Key Judgment Basis (Prior to Regular Cycles) Differential pressure gauge monitoring (core indicator The initial pressure difference of the high-efficiency filter (in a brand new state) is usually 100-300Pa. It needs to be replaced immediately when any of the following conditions is met: The actual operating pressure difference is ≥ 1.5 times the

To determine whether the high-efficiency filter (commonly H13/H14 grades) of the automatic double-door material shower needs to be replaced, it is necessary to take quantitative data as the core, performance testing as the support, and intuitive phenomena as the supplement, and make a comprehensive judgment in combination with the operating status of the equipment. Specifically, the following priority can be investigated I. Core Judgment Basis: Differential Pressure gauge monitoring data (The most intuitive and crucial) The pressure difference change of high-efficiency filters directly reflects the degree of filter material clogging and is the primary criterion for replacement. Basic premise: Record the initial pressure difference of the filter in a brand-new state (standard range: 100-300Pa, subject to the equipment manual). Change threshold (to be changed if any condition is met) : The operating pressure difference is ≥ 1.5 times the initial pressure difference (for example, if the initial pressure difference is 200Pa, when the pressure difference rises to 300Pa or more). If the operating pressure difference remains persistently above 500Pa (even if it does not reach 1.5 times the initial value, it indicates that the filter material is severely clogged, which will lead to a sudden drop in the air blowing

Explosion-proof air showers are mainly used in hazardous environments such as chemical engineering, petroleum, pharmaceuticals, and the production of flammable and explosive materials. Their daily maintenance needs to balance the functional guarantee of conventional air showers and explosion-proof safety requirements. The core principle is to prevent the generation of sparks, keep explosion-proof components intact, and ensure the safety of the electrical system. The following is a systematic daily maintenance plan: I. Daily Maintenance: Basic cleaning and functional inspection Cleaning operations (explosion-proof requirements are preferred) Use anti-static cleaning tools (such as anti-static cloths and anti-static vacuum cleaners). It is strictly forbidden to use tools that can easily produce sparks, such as wire balls and hard brushes. Cleaning areas: Inner walls of the air shower, air shower nozzles, door closers, floors, and stainless steel door frames. Remove dust, oil stains, and debris. If there are contaminants adhering, they can be wiped with a non-flammable neutral cleaner (such as a special explosion-proof cleaner). It is strictly prohibited to use flammable solvents such as alcohol or gasoline for large-scale cleaning. After cleaning, check: Ensure that the nozzles are not clogged, there is no water accumulation on the ground (to prevent electrical components from getting

To determine whether the filter of an explosion-proof air shower needs to be replaced, a comprehensive judgment should be made by combining pressure difference monitoring, visual inspection, functional effect and explosion-proof safety requirements. The core is to distinguish the different replacement standards of primary filters and high-efficiency filters, and at the same time avoid potential safety hazards during the inspection process. The following are the specific judgment methods: I. Core Judgment Basis: Differential Pressure Monitoring (the most scientific and preferred method) Both the primary and high-efficiency filters of explosion-proof air shower rooms need to be equipped with differential pressure gauges (some explosion-proof models use flameproof differential pressure gauges). By monitoring the resistance changes of the filters, the replacement timing can be determined. This is a commonly used precise standard in the industry. Primary filter Initial resistance: Usually 50 to 100Pa Replacement threshold: When the reading of the differential pressure gauge reaches twice the initial resistance or exceeds 200Pa, it must be replaced immediately (or cleaned and reused; if the resistance still exceeds the standard after cleaning, it must be replaced). Explosion-proof precautions: When inspecting the differential pressure gauge, use anti-static tools to wipe the dust off the dial. It is

The normal working pressure difference range of the air shower transfer window pressure difference gauge is mainly determined based on the initial pressure difference of the high-efficiency filter. The general reference standards and details are as follows: The initial pressure difference reference is the pressure difference when the air shower system is stably operating after the installation of the new high-efficiency filter. The conventional range is 5 to 15Pa (the specific value is subject to the equipment manual or the technical parameters of the high-efficiency filter). During normal operation, the reading of the differential pressure gauge should be maintained within the range of 1 to 2 times the initial differential pressure. For example, if the initial pressure difference is 10Pa, then the normal working pressure difference range is 10 to 20Pa. Regardless of the initial pressure difference, when the reading of the differential pressure gauge exceeds 25Pa or reaches twice the initial pressure difference, it is determined to be abnormal and the high-efficiency filter needs to be replaced in a timely manner. Key points to note This range is only for the resistance monitoring of high-efficiency filters. There is no separate chamber pressure difference requirement for the air shower transfer

A method for determining the replacement timing of the high-efficiency filter of the air shower transfer window based on the reading of the differential pressure gauge The core of the judgment is based on the initial pressure difference of the high-efficiency filter, combined with the changing trend of the pressure difference gauge reading and the warning threshold, which can accurately determine whether replacement is needed. The specific method is as follows: I. Core Judgment Criteria (Replacement is Required if any of the conditions is met) Threshold One: Reaching twice the initial pressure difference After the new high-efficiency filter is installed, the pressure difference recorded when the air shower system is operating stably is the initial pressure difference (conventionally 5-15Pa, subject to the equipment/filter manual). During operation, if the reading of the differential pressure gauge continuously exceeds twice the initial differential pressure, it indicates that the filter material of the filter has been severely clogged. The air volume of the air shower will drop significantly, and the purification effect cannot be guaranteed. Immediate replacement is required. Example: The initial pressure difference is 10Pa. When the reading remains ≥20Pa continuously, the high-efficiency filter needs to be replaced. Threshold Two: Reaching a general

The method for judging the normal state of the differential pressure gauge of the air shower transfer window The differential pressure gauge of the air shower transfer window is mainly used to monitor the resistance changes of the high-efficiency filter. Whether its reading is normal directly affects the purification effect of the air shower system and the operating status of the equipment. The following judgment methods are explained step by step and are applicable to on-site operation, maintenance and training scenarios. I. Prerequisite: Confirm that the foundation condition of the differential pressure gauge is normal Appearance and installation inspection The dial is undamaged, the scales are clear, and the hands are not stuck. Correct installation position: It should be installed vertically at an easily observable position outside the transfer window. The pressure guiding pipe should be firmly connected without any bends or air leaks. The interface of the pressure guiding pipe should be free from dust and oil stains. The positive pressure end should be connected upstream of the high-efficiency filter, and the negative pressure end should be connected downstream (or connected as indicated in the equipment manual). Zero position calibration verification When the equipment is completely powered off and

I. Standard Operating Procedures 1. Preparations before operation Check the appearance of the equipment: no damage, the door body closes tightly, and the indicator light of the interlock device is normal. Function check: Turn on the power, confirm that the fan starts up, the air outlet of the air shower nozzle is normal, and the differential pressure gauge shows within the qualified range (usually ≥10Pa). Environmental confirmation: Personnel in the clean area and non-clean area on both sides of the transfer window have all taken clean protective measures, and the surface of the items to be transferred is clean. 2. Item transfer process Operations on the non-clean area side Open the side door of the non-clean area (the side door of the clean area will automatically lock and the interlock will take effect). Place the items on the storage platform inside the transfer window to ensure that they do not block the nozzles or clog the return air passage. Close the side door of the non-clean area. Once the door is in place, the air shower system will start automatically (or manually press the “Air Shower Start” button). Air shower process The air shower time is set at 10 to