Articles in Focus
기술 칼럼
입자 여과, 화학 여과와 AMC, 내열·난연, 시험과 규격을 아우르는 에어필터 기술 칼럼입니다.
Particle Filtration19
High-Efficiency Filter vs HEPA Filter: The Efficiency Gap Behind the Name Confusion
What Is an FFU? Fan Filter Unit Specs, Airflow, Noise & AC/EC Motor Guide
Pre-Filter Selection Guide: G3 vs G4 vs F5 — Panel, Bag & Pleated Compared
Medium Filter Deep Dive: F7, F8, F9 — V-Bag, Mini-Pleat & Rigid Cell Compared
HVAC Filter Grade Chart: G4 to H14 — Which Grade Belongs at Each Stage?
The Hidden Enemy of Advanced Semiconductor Packaging: Heat-Resistant HEPA Self-Shedding
Can HEPA Filters Be Washed? An Engineer's Guide to Proper Maintenance
Replacing a HEPA Isn't "Pull Out, Push In": Six Mistakes That Ruin Whole Batches
ΔP of 5 Pa, Airflow 0.4 m/s — How Do You Actually Measure These?
Bag-In / Bag-Out (BIBO): When the Filter Itself Is the Hazard
Semiconductor Fab Air Filtration: Three Lines of Defense × Zone-by-Zone Cleanliness
Cleanroom Filter Replacement: When to Change — Three Triggers
HEPA or ULPA? What Do You Actually Get for 27% More Pressure Drop
Membrane-Based Air Filtration: Five Membranes, Five Battlefields
Carbon Nanofiber Filters: Direct Air Capture Inside Building HVAC
PM2.5 Indoor Air Quality: Is "Stay Inside and Close the Windows" Actually Safer?
AI in Air Filtration: The Filter Doesn't Get Smarter, the Decisions Around It Do
Sustainable Air Filters: Billions Thrown Out Yearly — What to Do
Self-Powered Outdoor Air Purifiers: Cleaning Air at Parks and Intersections
Chemical Filtration / AMC14
Acidic AMC control: what separates ion exchange resin from activated carbon is what it will not take in
How to Select a Chemical Filter Housing: Recirculation, Once-Through and Standalone Units, With Airflow Sizing
Regenerable Chemical Filters: A Complete Guide to Regeneration vs. Disposable Options
TVOC Filter Selection: Granular Carbon vs Honeycomb vs Impregnated Media Compared
EUV Lithography AMC Control: Why Sub-ppb Is the New Standard
Chemical Filter Lifecycle & TCO: From Breakthrough Prediction to Optimal Replacement Strategy
Chemical Filter Impregnation Guide: Matching Acid, Base, and Mixed Formulas to Target Gases
AMC Monitoring Technology Compared: IMS, SAW, CRDS, GC-MS — Which One to Use?
Chemical Filter V-Bank vs 4V vs 6V: How to Choose by Pressure Drop, Capacity, and TCO
Advanced Process AMC Control: How to Pick Specialty Filters for NMP, TMAH, and Boron
The Invisible Killer: How Semiconductor Fabs Fight AMC (Airborne Molecular Contamination)
PTFE Membrane vs Glass-Fiber: Why Glass-Fiber Fails in Acid-Etch Bays
AMC Case Study: Recovering From a 15× NH₃ Spike (De-Identified Case)
Activated Carbon Filters: One Filter, Three Basketball Courts Inside
Heat & Fire Resistance7
Predicting High-Temperature Filter Life: How Temperature and Airflow Determine Replacement Cycles
High-Temperature Filter Media Compared: Glass Fiber vs Quartz vs Metal Fiber vs Ceramic
FM vs UL vs EN 13501: Understanding the Three Major Fire Certifications for Air Filters
Sealants & Frames for High-Temperature Filters: The Media Survives — Will the Rest?
UL94 vs UL900 Fire-Rated Filters: Where They Are Required & Why Low Pressure Drop Matters Equally
High-Temp Filters: Diffusion Furnaces at 350 °C, Standard Filters Give Up at 70 °C
TIG Welding and Alloys: Why HEPA Frames and Cleanroom Piping Must Be TIG Welded
Testing & Standards8
EN 1822 HEPA/ULPA Grades: H13 99.95%, H14 99.995% at MPPS — Full E10-U17 Table
SEMI F21 AMC Classification: The Four Distinct Problems Behind "AMC" in a Semiconductor Fab
JIS B 9901 / B 8330 Filter Test Methods: What Do Those JIS Numbers in Japanese Procurement Specs Actually Mean?
ASHRAE 145.2 Chemical Filter Efficiency Test: How to Read Breakthrough Curves and Estimate Service Life
ISO 29463 vs EN 1822: Same Filter, Two Certifications — Which Should You Specify?
PAO Scan Test: How Do You Actually Verify a HEPA Has No Leaks?
ISO 14644-1 Cleanroom Class Chart: Class 1 to Class 9 Span a 100,000,000× Range
ISO 16890 Explained: Why Air Filter Labels All Changed After 2018
Industry Filter Knowledge4
Data Center & AI Server Room Air Filtration: Is MERV 13 Enough Under High Heat Density?
Hospital Isolation Room & Operating Room HEPA Configuration: Negative Pressure, Positive Pressure, and Buffer Anteroom — Three Pressure Logics Explained
Air Filtration Challenges in Lithium Battery Plants: Choosing Filters for Dryrooms at −40°C Dewpoint
Complete Guide to GMP Pharma HEPA Standards: How PIC/S, USP 797/800, and ISO 14644-2 Stack