G3 Washable Air Filter: Heavy-Duty Pre-Filtration for Commercial AHUs
Stop wasting operational budget on short-lived disposable panel filters. Designed for central air conditioning systems, our G3 Washable Aluminum Frame Panel Filter intercepts coarse dust particles (5 microns and larger) at the fresh air intake, extending the service life of secondary bag filters and HEPA units.
High-strength synthetic media combined with a rust-proof anodized aluminum profile delivers an initial resistance of just 35 Pa and withstands up to 5 wash cycles. Lower your annual filter expenditure while maintaining peak HVAC efficiency.
Custom sizes engineered to your exact housing specs.
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We offer flexible OEM/ODM manufacturing to match your exact dimension and efficiency requirements. Contact our team for a fast quote or to verify compatibility with a free test sample.
Engineered with an ultra-slim 21mm extruded aluminum alloy profile, this flat panel filter delivers superior structural rigidity while maximizing air handling unit (AHU) casing depth.
Low Initial Resistance (35 Pa): Powered by needle-punched non-woven synthetic media, it achieves a remarkably low pressure drop (35 Pa at 800–3200 m3/h capacity)—significantly reducing electrical load on blower motors and supporting energy-efficient building standards.
Heavy-Duty & Washable: The rust-proof anodized aluminum frame withstands continuous operating pressure without deformation, enabling the filter media to be easily removed, water-washed, and reinstalled across multiple maintenance cycles.
| Specification | Value | Condition |
| Filter Class / Efficiency | G3 / ISO Coarse 40% (Gravimetric) | Intercepts particles ≥5μm |
| Frame Material | Anodized Extruded Aluminum Profile | Rust-proof & lightweight |
| Filter Media | Washable Polycotton Non-Woven Synthetic | Reusable up to 3–5 cycles |
| Face Net / Grid | Aluminum Net / Galvanized Mesh Support | Structural stabilization |
| Standard Profile Thickness | 21 mm (Optional: 25mm, 46mm) | Ultra-slim flat panel profile |
| Initial Pressure Drop | 35 Pa | Measured at rated air volume |
| Final Recommended Pressure | 100 – 150 Pa | Cleaning / Replacement threshold |
| Operating Temperature | ≤80°C (Continuous) | Standard HVAC condition |
| Relative Humidity Resistance | ≤100% RH | Moisture-resistant synthetic media |
Fully customizable specifications available. For detailed technical data, please 【visit the product page】 or 【reach out to our technical team】directly.
This G3 aluminum frame pre-filter is specialized for seamless integration into central Air Handling Units (AHUs), fresh air fan coil systems, rooftop ventilation units, and commercial supply ductwork. It performs reliably across light-to-medium dust loading environments, making it an ideal choice for:
Commercial Properties: Office towers, shopping malls, hotel complexes, and public transit hubs.
Industrial Facilities: General assembly plants, electronics manufacturing, and light packaging workshops.
Its versatile construction serves as an effective first-stage barrier against atmospheric dust, lint, and pollen, with standard and custom dimensions available to fit major OEM ventilation housings.
To balance optimal filtration efficiency with operational cost savings, we recommend tailored maintenance schedules based on environmental dust levels:
Commercial Buildings & Office HVAC: Inspect pressure drop monthly; perform water washing every 2 to 3 months, and execute a full filter replacement every 12 months.
Factory Intakes & Industrial Workshops: Inspect monthly; wash media bi-monthly, and complete a full batch replacement every 6 months (or when initial static pressure doubles).
Frequently Asked Questions
Q: How many times can the G3 aluminum frame panel filter be washed before replacement?
A: The G3 synthetic polycotton media and anodized aluminum frame allow the filter to be water-washed or compressed-air cleaned 3 to 5 times under standard operating conditions. Replace the unit once fiber structure degradation or permanent differential pressure rise is observed.
Q: What is the initial pressure drop and airflow capacity of this 21mm primary panel air filter?
A: The initial resistance is 35Pa at standard face velocity, supporting rated airflow volumes from 800 m³/h (for 295x295x21mm) up to 3200 m³/h (for 595x595x21mm) to optimize fan energy consumption.
Q: Can this primary panel filter be custom-manufactured for specific AHU housing sizes?
A: Yes. As a direct B2B manufacturer, we produce custom frame depths (21mm, 25mm, 46mm) and custom face dimensions (e.g., 595x595mm, 495x495mm, 295x295mm) to match exact OEM air handling unit specifications.
Q: Is the aluminum frame panel air filter suitable for high-humidity fresh air intakes?
A: Yes. The corrosion-resistant aluminum alloy frame and synthetic non-woven filter media resist moisture, rust, and mold growth in ambient outdoor air intake systems and humid HVAC ductwork.
Q: What dust particle size and filtration class does this panel air filter cover?
A: Classified under G3 efficiency (ISO Coarse, gravimetric efficiency ~40%), this primary filter intercepts airborne dust particles, fibers, and coarse pollen larger than 5 microns during pre-treatment.
