As a critical sterile barrier for the transfer of materials within cleanroom environments, VHP (Vaporized Hydrogen Peroxide) pass boxes are directly linked to production compliance, product quality and safety, and operational efficiency across sectors such as pharmaceuticals, food production, and biological research. AN, a prominent supplier of cleanroom equipment in North China—possessing significant scale and technical expertise—integrates design, manufacturing, sales, and installation services. The company’s proprietary VHP pass-boxes are developed and manufactured in strict accordance with the ISO 9000 quality management system, the ISO 14644-1 standard, and national GMP (Good Manufacturing Practice) regulations for the pharmaceutical industry. Designed to meet the rigorous demands of cleanroom environments across various sectors, these units leverage core technical advantages and offer an excellent price-performance ratio, providing clients with reliable solutions for sterile material transfer.
Drawing on the product features, core advantages, and real-world application scenarios of AN’s proprietary VHP pass-through boxes, this guide provides a scientific, precise, and actionable reference for procurement. It is designed to help customers avoid common pitfalls, select the VHP pass-through box that best aligns with their specific needs—offering the optimal balance of performance and cost—and achieve standardized, highly efficient management of their sterilization and transfer processes.
I. Core Principles for Equipment Selection
Compliance, Scenario Suitability, and After-Sales Support
Taking into account the specific requirements of various sectors—such as pharmaceuticals, food production, and biological research—and the product positioning of AN’s proprietary VHP (Vaporized Hydrogen Peroxide) pass-boxes, the selection process should be guided by four core principles: compliance, scenario suitability, cost-effectiveness, and reliable after-sales support. It is essential to consider both compatibility with your existing cleanroom system and long-term operational costs, ensuring that the chosen equipment not only meets industry standards but also fully leverages its technical advantages.
Selection Considerations
01: Compliance and Suitability
When selecting a VHP (Vaporized Hydrogen Peroxide) pass-through box, it is essential to ensure strict adherence to the compliance standards relevant to your industry. This includes domestic and international regulations such as the Good Manufacturing Practice (GMP) for Drugs (2020 revision), General Hygienic Regulation for Food Production, ISO 14644 standards for cleanrooms, and FDA 21 CFR Part 11. AN’s proprietary products have undergone rigorous compliance testing. We provide comprehensive documentation—including third-party sterilization validation reports and equipment certificates—to help clients successfully pass industry audits and prevent production interruptions or product recalls caused by non-compliant equipment.
02: Application-Specific Alignment
The selection of a VHP pass-through box should be based on your specific operational environment—such as pharmaceutical aseptic cleanrooms, food freezing facilities, or biological sample repositories—taking into account factors like temperature, cleanliness classification, material types, and sterilization requirements.
03: Optimal Cost-Performance Ratio
When choosing a VHP pass-through box, balance the initial procurement cost against long-term operational expenses (including consumables, energy consumption, and maintenance). Prioritize equipment that offers the right configuration, high energy efficiency, and a long service life; avoid unnecessary expenditure on high-end features that do not add practical value to your specific needs.
04: Reliable After-Sales Support
Evaluate the manufacturer’s after-sales service capabilities. As a developer and manufacturer, AN offers a robust support system, including on-site installation, commissioning, operational training, spare parts supply, and 24-hour emergency repair services. With a warranty period of at least one year, we ensure the long-term, stable operation of your equipment and minimize losses due to downtime—a key advantage of choosing AN’s proprietary products.
II. Key Selection Parameters for VHP Pass-Boxes
Core Sterilization Parameters
The core parameters of the VHP pass-boxes developed in-house by AN directly determine their sterilization efficacy, adaptability, and regulatory compliance. When selecting a unit, customers should focus on these parameters and align the configuration with their specific operational requirements. This ensures that the advantages of AN’s proprietary technology are fully leveraged and that the chosen specifications are well-matched to actual needs.
Sterilization Efficacy: AN’s VHP pass-boxes meet sterile-grade sterilization standards, achieving a kill rate of ≥99.9999% (a log reduction value of ≥6) against resilient microorganisms such as *Bacillus atrophaeus* (ATCC 9372). These units are designed to satisfy stringent aseptic requirements—such as those for the transfer of sterile pharmaceutical preparations or biological samples—allowing customers to select a configuration that precisely matches their required sterilization grade without the need for subsequent upgrades or modifications.
VHP Concentration Control: Equipped with a proprietary dual-sensor dynamic concentration control system developed by AN, this technology maintains VHP levels within a stable range of 8–12 mg/L (the effective sterilization threshold). With a monitoring deviation of ≤0.5 mg/L, it effectively resolves the common industry issue where single-sensor systems achieve target concentrations only at specific points, leading to uneven distribution throughout the chamber. The system allows for dynamic concentration adjustments based on the microbial load of the items being transferred, ensuring both effective sterilization and the safety of materials across various risk levels.
Elimination of Sterilization "Blind Spots": Utilizing a proprietary 360° multi-nozzle design combined with a three-dimensional airflow circulation system—featuring adjustable nozzle angles (0–120°)—the technology eliminates sterilization "blind spots," such as corners within the transfer chamber or gaps in material racks. This ensures thorough sterilization for irregularly shaped items (e.g., bottled liquid pharmaceuticals, bagged excipients, or biological sample containers), leaving no risk of incomplete sterilization.
Residue Control: Through a dual-process approach—optimized ventilation/air exchange combined with catalytic decomposition—the residual hydrogen peroxide concentration post-sterilization is reduced to ≤0.1 mg/m³ (well below the safety standard of ≤1 ppm). This prevents residual agents from corroding materials, damaging equipment, or posing health risks to operators. This capability, which meets the stringent material safety requirements of sectors such as food and pharmaceuticals, stands as a core competitive advantage of AN’s proprietary products.
Structure and Material Parameters
01: Material Requirements
The interior walls of AN’s proprietary VHP pass-boxes are constructed from 316L stainless steel (with 304 stainless steel available as a cost-effective alternative for certain models). This material offers superior corrosion resistance and is easy to clean. All welds are polished to a surface roughness of Ra ≤ 0.4 μm, ensuring a seamless, crevice-free interior that prevents dirt accumulation and complies with GMP material standards for cleanroom equipment. The viewing window utilizes sealed tempered glass, providing both airtight integrity and clear visibility, allowing users to monitor material transfer and sterilization processes in real-time—meeting the stringent cleanliness control requirements of various industries.
02: Sealing Performance
The units feature a dual-seal system utilizing AN’s proprietary food-grade silicone rubber gaskets (with a 3mm compression). Combined with a rotary compression-style door locking mechanism, the overall leak rate is ≤ 0.1 Pa—well below the 0.5 Pa limit mandated by GMP. This design effectively prevents VHP leakage and the ingress of external contaminants. Furthermore, the seals are engineered for low-temperature environments, resisting degradation and aging to ensure a longer service life and reduced maintenance costs for the user.
03: Door Design
Equipped with a dual mechanical and electronic interlocking system, the design ensures that both doors cannot be opened simultaneously. This prevents the disruption of pressure differentials between clean zones and eliminates the risk of cross-contamination, maintaining the stability of the client’s cleanroom environment. The doors support either manual or automatic operation, facilitating convenient access for high-frequency material transfers and enhancing operational efficiency. Certain high-end models can be upgraded to fully automatic sensor-operated doors to further optimize the user experience.
04: Low-Temperature Compatibility
Designed specifically for low-temperature applications—such as food freezing facilities or biological sample repositories—AN’s specialized VHP pass-boxes operate reliably across a temperature range of -30°C to 50°C. Through a proprietary anti-freeze piping design, the system overcomes common industry challenges, such as the failure of UV lamps to ignite, the freezing of disinfectants, and the blockage of conduits due to ice formation. This ensures that the sterilization function remains fully operational in cold environments—a key competitive advantage that distinguishes AN’s proprietary products from similar offerings on the market.
Control System and Safety Parameters
Control System: Equipped with a PLC-based control system, it supports one-touch startup and parameter configuration (such as sterilization duration, concentration, and temperature). The system is user-friendly, requiring no specialized maintenance personnel and remaining well-suited for the skill levels of frontline operators. It features data traceability, automatically recording parameters—including concentration, duration, and pressure—for every sterilization cycle. These records are stored for at least three years, ensuring compliance with FDA 21 CFR Part 11 and facilitating seamless industry audits. Furthermore, the control system can be integrated with existing cleanroom monitoring systems or isolator units, enabling synchronized sterilization processes and data alignment, thereby reducing additional commissioning costs for the client.
Safety Protection: The unit incorporates multiple safety safeguards, including alarms for VHP leakage, over-temperature conditions, and door interlock status. In the event of an anomaly, the system triggers an immediate shutdown and alarm to prevent safety risks. During sterilization, the pass-through chamber maintains a negative pressure of -5 to -10 Pa; this ensures that even in the event of a minor leak, VHP cannot escape into the workspace, thereby safeguarding operators and meeting industry-standard safety requirements.
Dimensions and Selection: AN’s proprietary VHP pass-boxes are available in both standardized and customized sizes. Common standard dimensions include:
500×500×500 mm (small; suitable for biological samples and small reagents), 800×800×800 mm (medium; suitable for pharmaceutical products and food ingredients), and 1000×1000×1000 mm (large; suitable for bulky items or batch transfers). Clients may consult the AN sales team to determine the optimal dimensions based on their specific facility space, the size of the materials being transferred, and the frequency of use—ensuring an ideal balance that avoids excessive energy consumption (from oversized units) or reduced operational efficiency (from undersized units).
III. Scenario-Based Selection Solutions
Regulatory Compliance | Application-Specific Adaptation | After-Sales Support
AN’s in-house developed and manufactured VHP (Vaporized Hydrogen Peroxide) pass-through boxes are available in four major series, tailored to the specific operational requirements of industries such as pharmaceuticals, food production, and biological research. Clients can select the ideal model based on their specific industry environment and core needs—ensuring "on-demand selection and precise fit"—thereby maximizing product benefits while minimizing procurement and operational costs.
(I) Pharmaceutical Sterile Preparation Workshops (Injectables, Biologics)
Operational Context: These environments require high cleanliness standards (Grade A/B) and demand sterile-level sterilization. Materials typically include sterile equipment, pharmaceutical solutions, and finished products. There are stringent requirements for sterilization efficacy, residue control, and regulatory compliance. Some processes involve cold-chain storage, necessitating equipment with robust data traceability to meet export compliance standards.
Key Selection Criteria: The equipment must achieve a sterilization rate of ≥99.9999%. It should feature a proprietary dual-sensor dynamic concentration control system, allowing for real-time adjustment of VHP (Vaporized Hydrogen Peroxide) concentration (8–12 mg/L). Third-party validation reports (e.g., from SGS) are essential to confirm compliance with GMP Annex 1 (Sterile Medicinal Products), assisting clients in passing both domestic and international regulatory audits.
Constructed from 316L stainless steel with a leak rate of ≤0.1 Pa, the equipment includes residue detection capabilities to ensure post-sterilization residue levels remain ≤0.1 mg/m³. This prevents contamination of sterile materials and safeguards pharmaceutical quality and safety.
The control system supports data traceability and integrates with isolator systems, meeting FDA 21 CFR Part 11 requirements—a critical factor for clients exporting pharmaceutical products to European and American markets. For workshops involving cold-chain storage, a specialized low-temperature-compatible model is available, ensuring stable operation between -10°C and 50°C and preventing sterilization failure in cold environments.
II) Food Freezing/Refrigeration Facilities (Aquatic Products, Dairy, Frozen Foods)
Operational Context: These environments feature low temperatures (-30°C to 0°C) and involve the handling of frozen food products and raw materials. Requirements include rapid sterilization to prevent microbial contamination (e.g., *Salmonella*, *Listeria*), protection of equipment against cold-induced damage, high operational efficiency, long-term cost-effectiveness, and exceptional equipment durability.
Selection Criteria: AN’s solutions are purpose-built for low-temperature environments, ensuring stable operation across a full temperature range of -30°C to 50°C. Featuring a proprietary anti-freeze piping design, these units overcome common issues—such as the failure of sterilization lamps to ignite or the freezing of internal lines—ensuring consistent sterilization efficiency (with a kill rate of ≥99.999%) even in sub-zero conditions.
Sterilization cycles are optimized to 15–30 minutes, accommodating high-frequency material transfer without disrupting production workflows. Adjustable VHP (Vaporized Hydrogen Peroxide) concentrations allow for tailored sterilization parameters based on the specific food product (e.g., frozen meat, dairy), balancing effective decontamination with the preservation of food quality.
Constructed from corrosion-resistant, easy-to-clean 316L stainless steel and equipped with AN’s proprietary low-temperature, anti-aging seals, the units offer superior sealing performance—preventing the ingress of external contaminants while extending the equipment's service life. Low energy consumption and simplified maintenance requirements help significantly reduce operational costs for food production facilities.
(III) Biological Sample Repositories (Stem Cells, Research Samples)
Operational Context: Characterized by extremely low temperatures (-30°C to -10°C). Samples require stringent sterilization, rapid transfer, and preservation of biological activity; contamination and loss of viability must be strictly avoided. Furthermore, the system must provide comprehensive data traceability to meet scientific research compliance standards. Items typically consist of small sample boxes and reagent bottles.
Key Selection Criteria: High adaptability to low-temperature environments, with stable operation down to -30°C. The system should feature proprietary anti-freeze piping and specialized low-temperature thermal insulation to prevent equipment damage, ensuring that sterilization functions remain uninterrupted during sample transfer and maintaining a sterile, secure environment.
Sterilization cycles are limited to 15–25 minutes to minimize sample exposure time and preserve biological activity. VHP (Vaporized Hydrogen Peroxide) residue is kept at ≤0.1 mg/m³, preventing corrosion of sample containers or degradation of sample quality—meeting the rigorous demands of scientific research.
The control system offers precise parameter management and data traceability, recording the entire sterilization process in real-time to facilitate research documentation and compliance audits. The chamber dimensions are optimized for small items such as sample boxes and reagent bottles, and the inclusion of tiered shelving prevents the crushing of samples while enhancing transfer efficiency.
(IV) Non-Sterile Pharmaceutical/Food Production Facilities (Oral Solid Dosage Forms, General Food Products)
Operational Context: These environments require moderate cleanliness levels (ISO 7/ISO 8 standards). They necessitate surface disinfection and the maintenance of cleanliness. Materials handled typically include raw ingredients, excipients, and packaging supplies. The sterilization requirements are relatively moderate; the focus is on procurement cost-effectiveness, ease of operation and maintenance, and the avoidance of complex parameter configuration.
Selection Criteria: High cost-performance ratio, sterilization efficacy ≥99.99%, and adjustable VHP (Vaporized Hydrogen Peroxide) concentration (7–10 mg/L). These units meet fundamental sterilization and cleanliness requirements at an accessible price point, making them ideal for bulk procurement.
Construction: Available in 304 stainless steel (a cost-effective option). Features include a seal leakage rate of ≤0.1 Pa, along with essential interlocking and alarm functions to facilitate the clean transfer of materials. The systems are designed for simple operation and easy maintenance—requiring no complex parameter tuning—which aligns with the skill levels of frontline facility personnel and helps minimize operational costs.
Flexibility: Supports both standardized dimensions and basic customization. Units can be flexibly selected based on the client’s specific facility layout and material dimensions, ensuring a perfect fit for non-sterile production environments. Clients also benefit from comprehensive after-sales support.
IV. Core Advantages of VHP Pass-Through Boxes
Compliance, Scenario Adaptability, and After-Sales Support
As a company that independently develops and manufactures its own products, AN’s VHP pass-through boxes offer five core advantages. These key factors—which customers prioritize when making a purchase—ensure a worry-free experience from acquisition to daily operation.
Q: What are the advantages of your proprietary technology?
A: Backed by a professional R&D team focused on addressing customer pain points, we have independently developed core technologies such as a dual-sensor dynamic concentration control system, a 360° sterilization design with no "dead zones," and low-temperature anti-freeze technology. These innovations resolve common industry challenges—such as uneven sterilization, failure at low temperatures, and excessive chemical residues—ensuring our products remain at the forefront of technology and adaptable to diverse operational environments. Guided by our corporate values of "innovative development and the pursuit of excellence," we continuously optimize our product technology.
Q: How is quality guaranteed?
A: Our production process strictly adheres to the ISO 9000 quality management system. We operate specialized workshops for sheet metal fabrication, powder coating, welding, and assembly. Every unit undergoes rigorous factory testing and third-party verification, ensuring superior material quality, performance, and regulatory compliance. Our products are stable, reliable, and built for a long service life—reflecting our core philosophy that "quality is the lifeline of the enterprise."
Q: Do you offer customization?
A: We provide bespoke customization tailored to the specific requirements of each client’s environment—including dimensions, temperature ranges, sterilization levels, and control system integration. From initial design and R&D to manufacturing, installation, and commissioning, we offer dedicated, one-on-one service. This ensures our solutions precisely meet unique operational needs—setting us apart from standardized, off-the-shelf products—and aligns with our business philosophy of "quality, innovation, and mutual success."
Q: What about cost-effectiveness?
A: By handling both R&D and manufacturing in-house, we eliminate intermediaries, offering direct-from-factory supply that significantly reduces procurement costs. Furthermore, our products feature low energy consumption and are easy to maintain, lowering long-term operational expenses. We strike an ideal balance between high quality and cost-effectiveness, allowing clients to secure premium sterile transfer solutions within a reasonable budget.
Q: What are the advantages of your after-sales support?
A: We provide on-site installation, commissioning, and operational training. We ensure a timely supply of spare parts (such as sealing rings, VHP reagents, sensors, etc.) and offer a warranty period of at least one year. With 24-hour emergency repair capabilities, we respond rapidly to any equipment issues to minimize downtime. Furthermore, we provide long-term maintenance and operational consulting, ensuring the stable performance of your equipment through comprehensive, all-around support.
V. Customer Procurement Process and Acceptance Criteria
Mitigating procurement risks and ensuring product compliance
Procurement Process
Requirement Definition: The customer clarifies their specific application scenario (temperature, cleanliness class, material type, transfer frequency), sterilization requirements, regulatory compliance standards, and budget to establish core procurement needs.
Product Consultation: The customer contacts the AN sales team to outline their requirements. Professional sales staff then recommend suitable VHP (Vaporized Hydrogen Peroxide) pass-through chamber models from AN’s proprietary product line, providing details on specifications, advantages, and pricing.
Solution Confirmation: Based on the customer’s requirements, AN provides a comprehensive solution—including dimensions, configurations, customization details, pricing, and lead times. Once the customer confirms the solution, a procurement contract is signed.
Production and Delivery: AN manufactures the equipment in-house in accordance with the contract, conducts rigorous factory testing, and ensures timely delivery upon successful completion of these checks.
Installation and Acceptance: AN dispatches professional personnel to handle on-site installation and commissioning, and provides training for the customer’s operating staff. The customer then performs an acceptance review based on established criteria; once it is confirmed that the product meets all requirements, the delivery process is finalized.
Acceptance Criteria
Inspection of Appearance and Structure: Verify that the equipment materials, weld seams, and seals comply with contractual specifications (e.g., 316L/304 stainless steel). Ensure the door interlocking mechanism functions correctly, the chamber is free of "dead zones" and easy to clean, and—for equipment intended for low-temperature environments—that anti-freezing features are properly implemented. The exterior must be free of any damage or scratches.
Performance Verification: With the assistance of AN technical personnel, test the sterilization efficacy, VHP concentration distribution, residual concentration, and seal leakage rate; all results must meet contractual requirements and industry standards. For equipment used in low-temperature environments, conduct operational testing across the full temperature range of -30°C to 50°C to ensure stable performance.
Compliance Documentation: AN must provide necessary documentation—including the certificate of conformity, test reports, sterilization validation reports, and compliance certificates—to ensure the equipment meets the regulatory requirements of the client’s specific industry.
Operational Training: AN technical personnel must provide comprehensive training to the client’s operations and maintenance staff, ensuring they are proficient in equipment operation, parameter configuration, routine maintenance, and troubleshooting. Final acceptance is contingent upon the successful completion of this training.
VI. Recommendations for Routine Operation and Maintenance
Routine Maintenance and Troubleshooting
Routine Maintenance: Clean the equipment chamber and observation window daily to remove any material residue. Inspect sealing rings and nozzles weekly for integrity, and replace any aged or worn-out seals promptly (original spare parts are available from AN). Calibrate VHP sensors and concentration controllers monthly to ensure parameter accuracy. Replace VHP reagents and HEPA filters quarterly; regularly inspect low-temperature adaptation components (such as anti-freeze piping) and maintain detailed maintenance logs.
Operational Precautions: Operators must strictly follow established operating procedures when starting the equipment and ensure that sterilization parameters are set correctly. During the loading of materials, ensure that VHP nozzles are not obstructed; irregularly shaped items should be arranged in layers to ensure complete sterilization coverage without "dead zones." In low-temperature environments, preheat the equipment before startup to prevent damage to electronic components caused by the cold. Once sterilization is complete, verify that residual concentrations are within safe limits before opening the chamber door to prevent the leakage of residual agents.
Troubleshooting: In the event of issues such as leakage alarms or sterilization failures, stop the equipment immediately and investigate the cause (e.g., aged sealing rings, sensor malfunctions, or insufficient VHP reagent). If the issue cannot be resolved internally, contact the AN after-sales support team; unauthorized or improper troubleshooting is strictly prohibited. If the equipment fails to start in a low-temperature environment, check the anti-freeze components and power supply; do not attempt a forced startup, as this may damage the equipment.
Compliance Management: Regularly organize equipment operational data, maintenance logs, and validation reports to ensure data traceability and compliance with industry audit requirements. Annually, you may coordinate with AN to engage a third-party organization to conduct a comprehensive validation of sterilization efficacy, ensuring the equipment consistently meets operational standards over the long term.
