In high-humidity environments, coastal facilities, and chemical processing plants, traditional paper frames soften and steel frames eventually corrode. The G3/G4 Plastic Frame Pleated Air Filter delivers an impervious, 100% rust-proof primary filtration barrier built to withstand wet air streams, mild chemical vapors, and frequent washdowns.
- 100% Rust & Corrosion Immunity: High-impact plastic construction eliminates rust, frame softening, and structural breakdown in 100% RH environments.
- Zero Air Bypass: Rigid molded frame contours maintain tight sealing along unit slides, preventing untreated air leakage around the filter perimeter.
- Protects Downstream Assets: Captures coarse airborne particles (5 microns and larger) before wet, dirty air fouls costly secondary or chemical gas-phase filters.
- Eco-Friendly Disposal: Fully incinerable design allows environmentally safe disposal without requiring metal frame disassembly.
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Designed for wet, corrosive, or demanding washdown zones, this plastic panel filter combines robust polymer engineering with low-resistance synthetic pleat geometry.
- High-Impact ABS / Polypropylene Frame: Molded frame structure offers superior chemical inertness, high moisture tolerance, and excellent structural rigidity.
- Hydrophobic Synthetic Media: Non-hygroscopic polyester pleats resist moisture absorption, preventing microbial growth and mold buildup in high-humidity airflow.
- Thermal Fusion Sealing: Filter media is thermally bonded directly to the plastic frame inner walls, creating a seamless leak-proof envelope under pressure.
- Lightweight Energy Efficiency: Reduced physical weight lowers shipping costs and allows effortless, tool-free installation in elevated HVAC banks.
| Specification | Parameter |
| Filter Class (EN779 / ISO 16890) | G3 / G4 (Coarse 50% – 65%) |
| Frame Material Profile | High-Impact ABS / Polypropylene (100% Rust-Proof) |
| Available Frame Depths | 21mm, 25mm, 46mm, 96mm (Custom options available) |
| Filter Media Type | Hydrophobic non-woven synthetic polyester pleats |
| Initial Resistance | ~38 Pa (G3) / ~48 Pa (G4) at nominal airflow |
| Recommended Final Resistance | 150 – 220 Pa |
| Max Operating Temperature | Continuous 70°C (158°F) |
| Relative Humidity Tolerance | 100% RH (Impervious to moisture & wet spray) |
Fully customizable specifications available. For detailed technical data, please 【visit the product page】 or 【reach out to our technical team】directly.
This corrosion-resistant plastic frame filter is tailored for wet, chemical-laden, or environmentally sensitive air processing equipment:
Equipment Compatibility: Fits standard air handling units (AHUs), coastal rooftop intakes, air scrubbers, and high-humidity ductwork networks.
Food Processing & Beverage Plants: Ideal for washdown-prone intake zones and ambient processing areas requiring corrosion-free air components.
Chemical & Coastal Facilities: Essential for offshore platforms, wastewater plants, and fertilizer facilities exposed to salt air and acidic/alkaline mist.
Plant engineers should schedule replacement routines based on local humidity and ambient contamination loads:
Wet Industrial & Chemical Duty: Inspect pressure gauges bi-weekly; service or replace filters every 30 to 60 days under continuous high moisture.
General Commercial / Coastal HVAC: In standard humid intake environments, replace filters every 60 to 90 days to ensure uniform airflow.
Maintenance Protocol: Monitor initial vs. final static pressure drop to prevent fan motor overload and optimize bulk consumable purchasing schedules.
Frequently Asked Questions About G3/G4 Plastic Frame Air Filters
Q1: What are the main advantages of a plastic frame over metal or cardboard in wet HVAC environments?
A1: Plastic frames will never rust, corrode, or soften when exposed to 100% RH humidity, water spray, or mild chemicals. Unlike metal, they are lightweight and completely incinerable for easier waste management.
Q2: Can plastic frame pleated filters withstand chemical fumes in industrial air intakes?
A2: Yes. Molded polypropylene and ABS frames offer excellent chemical resistance against mild acids, alkalis, and organic solvents, preserving structural stability where metal or paper frames deteriorate.
Q3: Are these G3/G4 plastic panel filters available in custom sizes and frame depths?
A3: Yes. As a direct factory manufacturer, we offer standard commercial dimensions as well as custom extruded and molded sizes with profile depths such as 21mm, 25mm, 46mm, and 96mm.
Q4: How does the hydrophobic synthetic media handle continuous moisture loading?
A4: The media blend is non-hygroscopic, meaning it does not absorb water. Water droplets pool off the pleat surfaces without blinding the airflow paths, maintaining low pressure drop and preventing mold development.
Q5: What standard packaging is used for ocean freight shipments of plastic frame filters?
A5: Filters are shrink-wrapped or packed in sealed polybags within reinforced corrugated master cartons, palletized, and stretch-wrapped to protect against transit shocks and tropical humidity during international shipping.
