Explore our industrial-grade, certified air purification products designed for low pressure drop, high dust-holding capacity, and strict regulatory compliance.
The global demand for high-performance duct air filtration systems has experienced a massive structural shift over the last decade. Driven by rising indoor air quality (IAQ) requirements, rapid industrialization, and stringent health regulations post-pandemic, HVAC system designers are prioritizing multi-stage filtration solutions. Air quality regulations—such as Europe’s EN 779:2012, the updated ISO 16890 standard, and the United States’ ASHRAE 52.2—have compelled industrial operators to move beyond simple dust capture.
Modern ventilation configurations require filters to achieve predictable particulate fractional efficiency while minimizing the system's overall static pressure. Energy consumption of supply fans is directly proportional to filter resistance; therefore, selecting optimized, aerodynamically balanced duct air filters is critical to reducing manufacturing facility operating costs. From primary pleated pre-filters to advanced mini-pleated HEPA units, selecting the correct media and structural frames directly influences green building certifications, such as LEED or BREEAM.
Unlike old particulate standardizations based solely on average synthetic dust weight arrestance, ISO 16890 evaluates filters against three distinct size ranges: PM1 (≤1 µm), PM2.5 (≤2.5 µm), and PM10 (≤10 µm). Selecting filters certified to meet specific PM fractional requirements ensures that downstream cooling coils remain free of bio-fouling and process air is clean enough for advanced electronic assemblies.
We leverage our 10+ years of manufacturing experience to design custom air filters. Regardless of physical dimensions, operating temperatures, or custom framing materials, our engineering division crafts bespoke filtration components designed to fit seamlessly into specialized AHUs and inline duct filter boxes.
Our entire commercial catalog undergoes rigorous mechanical testing in compliance with European directives. CE marking guarantees our products meet strict safety, health, and environmental protection requirements. Every batch is evaluated to confirm structural integrity under variable high-flow environments.
Utilizing composite synthetic fibers, heat-laminated progressive density medias, activated carbon matrixes, and ultra-fine glass microfiber papers, our products deliver exceptional dust holding capacity (DHC) while preserving the low initial resistance crucial for energy conservation.
A premier global supply chain partner supplying robust commercial HVAC filter systems, high-efficiency cleanroom terminals, and customized industrial purification arrays.
Strategically situated in Guangzhou, Southern China—only 10 kilometers away from the Guangzhou Baiyun International Airport—Guangzhou LJF Air Purification Equipment Co., Ltd. is a high-growth manufacturer specializing in commercial and industrial air filtration products. Our optimal geographical position enables rapid delivery times, efficient logistics integration, and simplified customs clearance processes for our global network of customers.
Over our decade-long history, we have successfully developed trusted commercial partnerships with more than 100 enterprise clients across 30+ countries. We continuously invest in advanced machinery, structural welding systems, auto-pleating assemblies, and specialized testing chambers to manufacture high-yield filter arrays. Our products are actively utilized in electronic manufacturing, semiconductor fabrication, liquid crystal display (LCD) foundries, biopharmaceutical laboratories, food processing facilities, medical cleanrooms, hospital ventilation, and automotive spray paint booths.
Our Mission: To bridge the gap between premium performance, technological engineering, and accessible manufacturing pricing. We work closely with distribution partners, mechanical contractors, and industrial procurement managers to lower HVAC system maintenance cycles and improve operation sustainability.
Our state-of-the-art facility uses highly structured stages to guarantee dimensional consistency and leak-free reliability for every duct air filter.
Every order is carefully inspected, boxed, and palletized to prevent moisture absorption and structural damage during international shipping.
Understanding comparative international filtration standards helps engineers select the optimal filter configuration for their local HVAC regulations.
Designing a reliable duct air filtration layout requires understanding the relationship between EN 779, ISO 16890, and ASHRAE 52.2 standards. Industrial cleanroom projects often require high-capacity, multi-stage pre-filters (M5 to F7) upstream of terminal H13/H14 HEPA units to prevent premature particulate loading. Choosing the right replacement timeline helps control energy costs and prevent bypass leakage.
| EN 779 Class | ISO 16890 Range | ASHRAE 52.2 equivalent | Typical Application Fields | Recommended Replacement DP |
|---|---|---|---|---|
| G3 - G4 | Coarse 50% - 85% | MERV 5 - 8 | HVAC Pre-filters, Air Handling intake, basic protection | 250 Pa |
| M5 - M6 | ePM10 > 50% / ePM2.5 > 50% | MERV 9 - 12 | Secondary industrial filtration, commercial offices | 300 Pa |
| F7 - F9 | ePM1 > 50% to > 80% | MERV 13 - 15 | Food processing, hospital HVAC, paint spray line prep | 400 Pa |
| H13 - H14 (HEPA) | ePM1 > 99.95% (EN 1822) | MERV 17 - 19 | Microelectronics cleanrooms, bio-pharmaceuticals | 600 Pa |
The performance of an air filter depends heavily on its media composition. Traditional glass fiber delivers exceptional fine particulate containment but exhibits higher initial resistance. On the other hand, synthetic polymer pocket bag configurations leverage progressive-density layers to distribute dust throughout the depth of the pocket, lowering operating pressure drop and extending service life.
In applications with volatile organic compound (VOC) presence, combining mechanical filtration with chemical adsorption media is critical. High-efficiency activated carbon matrices bond with gaseous pollutants through physical adsorption, neutralizing odors and preventing VOC build-up in closed-circuit recirculation loops.
Our air filtration systems are designed to meet the strict regulatory guidelines of critical manufacturing, commercial, and healthcare environments.
Pharmaceutical processes require sterile, micro-contaminant-free environments to prevent product contamination. Our custom mini-pleat HEPA filters and fan filter units (FFUs) are engineered to deliver reliable air change rates, maintaining ISO Class 5 cleanroom conditions.
Silicon wafer fabrication requires pristine environments free of sub-micron particulates. Even minute dust particles can cause manufacturing defects. Our cleanroom filtration solutions ensure reliable control over airborne molecular contamination (AMC) and sub-micron particulates.
A flawless exterior finish requires dirt-free spray booths. We supply paint arrestor pocket filters, laminated G3/G4 media rolls, and V-type pleated paint filter paper designed to capture overspray, protect exhaust ducts, and control paint particulate release.
Maximize HVAC lifetimes with our highly durable pocket bags, high-temp filters, and bulk filtration media rolls direct from our manufacturing facility.
Technical guidance regarding CE certification requirements, maintenance best practices, and material selection for industrial HVAC systems.
Guangzhou LJF works closely with you to design, manufacture, and deliver the optimal air filtration solutions for your specific facilities.
Our customer-first culture ensures that our engineering, production, and support teams work closely with you to resolve your filtration and system design requirements.
Whether you require standard size classifications or specialized custom configurations, our technical support engineers will guide you from initial prototyping to final volume production.
We are committed to building long-term, mutually beneficial relationships with distributors, contractors, and corporate clients around the globe.
LJF Air FILTER
