Cardboard filters

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Cardboard Carton Filters: Class G4

The cardboard-framed filter (Class G4) is a pre-filter used to capture large, coarse particles in HVAC systems.

Specifications and Characteristics:

Efficiency Class (Class G4): Classified as a coarse filter under the EN779 standard, with a synthetic dust capture efficiency of approximately 90%.

Target Particle Size: Designed to capture particles larger than 10 micrometers (e.g., coarse dust, sand, pollen, hair, insects, and leaves).

Frame Design: Features a durable, deformation-resistant cardboard frame, typically with a V-shaped pleated design to increase surface area, enhance dust-holding capacity, and reduce airflow resistance.

Function and Importance

• Pre-filtration: Installed at the air intake stage to protect high-efficiency main filters (such as F7, F9, or HEPA) from clogging.

• Equipment Protection: Prevents dirt from entering the fans and motors of Air Handling Units (AHUs) and ventilation ducts, thereby extending the system's operational lifespan and cost-effectiveness.