G4 Cardboard frame Pre-Air Filter

Cardboard Pre- filters are widely used in 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.The filter media is the part that actually performs the filtration.

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.

1. Size Matching: Accurately measure the installation space (track or bolt holes) to ensure a perfect fit and prevent air "short-circuiting" (unfiltered air bypassing the filter through gaps).

2. Environment Assessment: If the operating environment is very humid, strongly consider choosing a primary filter with a metal frame (e.g., aluminum). Although slightly more expensive, its stability and service life far exceed those of paper frames.

3. Regular Inspection and Replacement: Primary filters are consumables and must be inspected regularly. Replace promptly when:

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.

4. Installation Direction: Pay attention to the airflow direction arrow on the filter and ensure correct installation.made according to specific conditions.

· G2/G3: The most common grades, suitable for general ventilation systems.

· G4: Higher efficiency, capturing finer particles. Often used in places with slightly higher cleanliness requirements or as a pre-filter for medium-efficiency filters.

Remarks: (1) Initial resistance tolerance of± 10%   (2) Support customer size