G4 Cardboard Frame Pre-Air Filter - China Suppliers and Factory | High Efficiency & Standard Compliance
- Return air sections of commercial and residential central air conditioning systems; pre-treatment for fresh air system intakes
- Ventilation equipment in office buildings, shopping malls, hotels, and schools
- Primary pre-filtration in industrial plants and production workshops
- Air conditioning equipment in computer rooms and communication base stations
- Household fresh air ventilators and air purifiers (as a pre-filter)
The frame of a cardboard frame pre filter is typically made from high-quality kraft paperboard or high-strength corrugated paper. The selection of this material is carefully considered:
✦ Advantages
Low Cost: One of the most economical filter types on the market, ideal for applications requiring regular bulk replacement.
Lightweight and Easy Installation: The paper frame makes it very lightweight, easy to install and remove.
Low Initial Air Resistance: Its loose structure ensures good air flow, places less demand on system fan pressure, and contributes to energy savings.
Moderate Dust-Holding Capacity: The pleated design provides decent dust loading capacity, extending the replacement cycle (compared to more basic mesh filters).
Eco-friendly: Main materials (paper frame, some filter media) are biodegradable or can be incinerated, resulting in a relatively lower environmental burden.
⚙ Common types include Metal Mesh
Characteristics: Typically aluminum or stainless steel mesh; washable, reusable, with good durability.
Used in situations requiring higher standards and reusable, but the cost is higher than that of paper media.
- The filter media appears visibly darkened and saturated with dust.
- Increased air resistance leads to a significant reduction in airflow.
- The paper frame is damp, deformed, or damaged.
- Typical replacement cycles are 1–3 months, depending on environmental dust concentration and usage frequency.
The most common grades, suitable for general ventilation systems.
Higher efficiency, capturing finer particles. Often used in places with slightly higher cleanliness requirements or as a pre-filter for medium-efficiency filters.
