EV Charging Stations
Filtration for Power Equipment
Cleanroom & Semiconductor
Ultra-High Cleanliness Filtration
Commercial HVAC
Central Air System Filtration
Data Centers
Precision Equipment Protection
Livestock & Farming
Farming Environment Purification
Spray Booths & Industrial Dust
Paint Mist & Dust Purification
EV Charging Stations
Industry ApplicationsFiltration for Power Equipment
Professional air filtration for EV charging devices, protecting against dust and sand ingress to ensure stable, reliable operation of charging piles and station infrastructure.
View Related Products →Cleanroom & Semiconductor
Industry ApplicationsUltra-High Cleanliness Filtration
Ultra-high efficiency filtration for semiconductor wafer fabs and precision electronics cleanrooms, capturing nano-scale particles to meet ISO Class 1–3 standards and maximize product yield.
View Related Products →Commercial HVAC
Industry ApplicationsCentral Air System Filtration
High-efficiency filtration for commercial building HVAC systems, improving indoor air quality, reducing energy consumption, and extending equipment service life.
View Related Products →Data Centers
Industry ApplicationsPrecision Equipment Protection
Precision air filtration for data centers, shielding servers and critical hardware from dust contamination to keep cooling systems running efficiently and reliably.
View Related Products →Livestock & Farming
Industry ApplicationsFarming Environment Purification
Dedicated filtration systems for farms and livestock facilities — capturing dust, adsorbing ammonia, and inhibiting pathogen spread to improve animal health and overall productivity.
View Related Products →Spray Booths & Industrial Dust
Industry ApplicationsPaint Mist & Dust Purification
Designed for spray booths and grinding workshops, efficiently capturing paint mist, metal dust, and wood chips to meet emission standards while protecting finished surface quality.
View Related Products →
Pre-Filter (G1–G4)
First-Stage Large-Particle Capture
Medium-Efficiency Filter (F5–F9)
Precise PM2.5 Capture
HEPA High-Efficiency Filter
Sterile-Grade Purification
ULPA Ultra-High Efficiency Filter
Sub-Micron Particle Capture
Pre-Filter (G1–G4)
Product PerformanceFirst-Stage Large-Particle Capture
The first line of defense, capturing particles ≥5 μm such as dust, hair, and fibers to protect downstream filters and extend overall system service life.
View Related Products →Medium-Efficiency Filter (F5–F9)
Product PerformancePrecise PM2.5 Capture
Captures fine particles of 1–5 μm including PM2.5, pollen, and mold spores, significantly improving indoor air quality for commercial HVAC and ventilation systems.
View Related Products →HEPA High-Efficiency Filter
Product PerformanceSterile-Grade Purification
≥99.97% filtration efficiency for particles ≥0.3 μm, delivering sterile-grade clean air widely used in medical, pharmaceutical, and electronics manufacturing.
View Related Products →ULPA Ultra-High Efficiency Filter
Product PerformanceSub-Micron Particle Capture
≥99.9995% efficiency for particles ≥0.12 μm, meeting the extreme cleanliness demands of semiconductor fabs, aerospace, and other ultra-precision applications.
View Related Products →
High-Temperature Resistant
Industrial-Grade Heat Tolerance
Washable & Reusable
Cut Costs, Reduce Waste
Activated Carbon
Odor & Harmful Gas Removal
Bag Filter
High Dust-Holding, Long Life
Panel / Pleated Filter
Compact Space-Saving Design
Low-Resistance Airflow
Energy-Saving Operation
High-Temperature Resistant
Product FeaturesIndustrial-Grade Heat Tolerance
Built with specialized heat-resistant materials, operating stably up to 250°C for paint ovens, industrial dryers, and high-temperature process environments.
View Related Products →Washable & Reusable
Product FeaturesCut Costs, Reduce Waste
Cleanable by water washing or air blowing, reusable multiple times to significantly reduce replacement frequency and O&M costs — an economical, eco-friendly choice.
View Related Products →Activated Carbon
Product FeaturesOdor & Harmful Gas Removal
Leverages activated carbon's high adsorption capacity to eliminate odors, VOCs, and formaldehyde, ideal for newly renovated spaces and industrial exhaust treatment.
View Related Products →Bag Filter
Product FeaturesHigh Dust-Holding, Long Life
Bag-style construction delivers a larger filtration area, high dust-holding capacity, and extended service life — ideal for high-dust environments with reduced replacement frequency.
View Related Products →Panel / Pleated Filter
Product FeaturesCompact Space-Saving Design
Compact form factor for easy installation and replacement; pleated structure maximizes filtration area within a small footprint for higher efficiency.
View Related Products →Low-Resistance Airflow
Product FeaturesEnergy-Saving Operation
Low-resistance design minimizes pressure drop while maintaining filtration performance, reducing fan energy consumption for cost-effective, eco-friendly operation.
View Related Products →
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> 产品知识2026-02-01G4 Filter | Coarse Pre-Filter Solutions for Industrial & Commercial HVAC Systems
In modern commercial and industrial HVAC systems, G4 filter solutions — including blue G4 filter media, coarse filters, and pre-filters — are fundamental components for protecting downstream equipment and ensuring effective air quality management. As a critical first stage in multi-stage filtration systems, G4 filters balance dust capture performance with low operational resistance, optimizing both cost and airflow efficiency.
What Is a G4 Grade Filter? | G4 Filters Explained
A G4 grade filter is an air filtration product classified under the European standard EN 779 (and now reflected in the ISO 16890 framework as ISO Coarse ePM10 <50%). These filters are designed to capture larger airborne particles — typically >10 µm, such as dust, lint, pollen, and hair — before air moves into finer filtration stages.
Key characteristics of G4 filters include:
Coarse particle capture: Efficient removal of visible particulate matter that can clog equipment.
Low airflow resistance: Minimal pressure drop keeps operating costs and fan energy use low.
Pre-filter role: Often installed as the first filtration stage in industrial HVAC, commercial buildings, or data center environments.
In many OEM products, the blue G4 filter media color identifies the coarse pre-filter grade, helping maintenance teams quickly distinguish it in multi-filter assemblies.
G4 Filters vs. F7 Filters | Understanding the Filtration Difference
A common question in HVAC purchasing and system design is: “What is the difference between G4 and F7 filters?”
In essence:
G4 filters are coarse pre-filters capturing large particles (~10 µm and above). They serve to protect and prolong the life of downstream filtration components.
F7 filters are fine filters capable of capturing much smaller particles — including fine dust, PM2.5, and some allergens. They are typically used in final or secondary stages when air quality requirements are higher.
Feature
G4 Filter
F7 Filter
Classification
Coarse (EN779 / ISO Coarse)
Fine (EN779 / ISO ePM1)
Particle Size Targeted
>10 µm
~1 µm
Typical Function
Pre-filter
Final / Fine filter
Airflow Resistance
Low
Moderate to high
Application
Industrial, commercial HVAC
Indoor air quality focused
Using a G4 filter as a pre-filter ahead of an F7 main filter is a best practice in many B2B HVAC systems, balancing equipment protection with clean air delivery.
What MERV Rating Is G4? | Comparing MERV and EN/ISO Standards
MERV (Minimum Efficiency Reporting Value) is a North American filter efficiency scale commonly used in HVAC specification sheets. While G4 is an EN (European) classification, its approximate MERV equivalent helps global buyers compare products:
G4 filter ≈ MERV 7–8 — meaning it offers moderate efficiency and primarily targets coarse particles.
Higher MERV ratings (10–13+) correspond to filters that capture increasingly smaller particulate sizes.
This equivalence is useful for product spec comparison in regions where MERV is standard.
Is a G4 Filter Washable? | Reusable vs. Disposable Coarse Filters
Many industrial G4 filters are disposable — designed to be replaced when clogged. However, washable G4 filters also exist, particularly in reusable mesh panel formats meant to protect higher-efficiency downstream filters (e.g., HEPA).
Best practice:
Confirm washability with the manufacturer.
Limit wash cycles to manufacturer guidelines to avoid media degradation.
Monitor pressure drop after cleaning — a significant increase can indicate reduced performance.
Applications and Benefits of G4 Coarse Filters in B2B Environments
Industrial & commercial HVAC: G4 filters are widely used in office buildings, manufacturing facilities, and industrial ventilation systems to trap bulk contaminants before they reach finer filters or sensitive equipment.
Air handling units (AHUs): As primary pre-filters, G4 filters improve indoor air quality and reduce maintenance frequency on high-efficiency filters.
Custom filter solutions: Suppliers often offer customizable G4 pre-filter media (including blue filter media rolls and framed panels) to fit specific system dimensions and operational demands.
Maintenance Tips from Industry Practitioners
Practitioners in HVAC forums emphasize the importance of filter replacement frequency, especially in dusty or high-traffic environments. Filters left in place too long can severely restrict airflow, increase energy use, and reduce overall system efficiency. Regular inspection and replacement — especially for the coarse G4 stage — keeps systems operating optimally.
Conclusion: Choosing the Right G4 Filter for Your System
For B2B buyers specifying HVAC filtration:
Use G4 filters as effective coarse pre-filters to protect downstream systems.
Pair G4 pre-filters with fine filters (e.g., F7) when indoor air quality is a priority.
Confirm MERV equivalents and performance specs when comparing international products.
Evaluate washable vs. disposable options based on lifecycle costs and maintenance strategy.
This approach ensures robust, cost-efficient filtration solutions tailored to specific industrial or commercial HVAC requirements.
👉 Whalesens Technology — Experience the Future of Air Purification
✅ Free Technical Consultation: Expert guidance on the latest technologies and applicability.
✅ Customized Solutions: Tailored filter systems designed for your specific needs.
🔍 Common Air Filter Types
Bag Filters: Remove medium to large particles such as dust and pollen; ideal for livestock farms, industrial facilities, and schools.
Panel Filters: Serve as primary or medium-efficiency filters to protect equipment and extend the life of high-efficiency filters.
HEPA Filters: Capture PM2.5, pollen, bacteria, and most airborne particulates; perfect for classrooms, laboratories, and medical environments.
Activated Carbon Filters: Remove gaseous pollutants, odors, and volatile organic compounds; suitable for food processing, livestock, and enclosed spaces.
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