As awareness of health issues continues to grow, indoor air quality has become an increasing concern. Facing multiple air threats including smog, pollen, bacteria, and construction pollution, selecting the proper air filtration system is crucial. G4 and F7 filters have emerged as ideal solutions for creating dual protection in indoor air purification due to their unique performance advantages.
Understanding Filter Classification Standards
Before examining G4 and F7 filters in detail, it's essential to understand air filter classification standards. Two primary international standards exist: the EN779 standard with G-grade (coarse) and F-grade (medium efficiency) filters, and the ISO 16890 standard with ePM ratings.
The EN779 standard classifies filters into four coarse filter grades (G1-G4) and five medium efficiency grades (F5-F9) based on their average arrestance and dust holding capacity. The ISO 16890 standard provides more granular classification by measuring filtration efficiency against PM10, PM2.5, and PM1 particles.
G4 Filters: The First Line of Defense
As representative coarse filters, G4 filters primarily capture larger airborne particles. According to EN779 standards, they effectively intercept particles larger than 10 microns, such as dust, sand, hair, and insects. In the ISO 16890 system, G4 filters are classified as ISO Coarse, indicating their focus on larger particulates.
Typically installed at the air filtration system's intake point, G4 filters serve critical pre-filtration functions:
-
Extending the lifespan of subsequent filters by capturing larger particles first
-
Protecting ventilation equipment from dust accumulation and damage
-
Providing preliminary air purification by reducing visible dust
-
Being cost-effective solutions for residential and commercial applications
However, G4 filters have limitations in capturing finer particles below 10 microns, necessitating combination with higher-grade filters for comprehensive air purification.
F7 Filters: Advanced Particle Filtration
As medium efficiency filters, F7 models offer significantly higher precision than G4 filters. Under EN779 standards, they effectively capture particles between 1-10 microns, including pollen, bacteria, mold spores, and some PM2.5. In the ISO 16890 system, they achieve ISO ePM1 classification, indicating effectiveness against sub-micron particles.
Installed after G4 filters in air systems, F7 filters provide deep purification with several advantages:
-
Removing allergens and pathogens to reduce respiratory risks
-
Eliminating odors and smoke for improved indoor air quality
-
Providing enhanced protection for sensitive groups including allergy sufferers
-
Being ideal for environments with higher air quality requirements
F7 filters require more frequent replacement due to lower dust capacity and represent higher operational costs compared to G4 filters.
The Optimal Combination: G4 + F7
The complementary nature of G4 and F7 filters creates an efficient air purification system when used sequentially. The G4 filter serves as the preliminary barrier, while the F7 provides secondary fine filtration. This combination offers:
-
Comprehensive air purification across particle sizes
-
Extended operational life for the more expensive F7 filter
-
Protection for ventilation system components
-
Versatility for various residential and commercial applications
When selecting filters, considerations should include manufacturer reputation, filtration efficiency ratings, material safety, and proper maintenance schedules. Experts recommend replacing filters every 3-6 months depending on usage conditions.
As air quality concerns continue growing globally, effective filtration systems combining G4 and F7 filters provide practical solutions for healthier indoor environments. Their complementary functions create efficient air purification systems that address both large and fine particulate matter, offering comprehensive protection for residential and commercial spaces.
Your message must be between 20-3,000 characters!