1. Function

Provides the first stage of coarse filtration, trapping large particles such as dust, hair, lint, insects and debris, thereby protecting the downstream medium-efficiency and high-efficiency filters and extending their service life.

2. Filtration Grade

G1, G2, G3, G4 (most commonly used)

3. Material

  • Non-woven fabric
  • Polyester fibre
  • Aluminium frame/paper frame/galvanised frame

4. Types

Panel, pleated, and bag-type pre-filters.

5. Applications

Air inlets of air showers, fresh air handling units for air conditioning, central air conditioning systems, workshop return air and exhaust systems.

6. Replacement Interval

Clean or replace every 1–3 months.

7. Particle Size Range

Intercepts large dust particles of 5 μm and above.