EN
GUANLIN G4 primary efficiency paper frame filter, pleated panel pre-filter for AHU, HVAC and cleanroom supply air.
G4 primary efficiency pleated panel filters with rigid moisture-resistant frames, protecting AHU coils and downstream medium and HEPA stages from coarse dust.
Description
G4 primary efficiency paper frame filters are the first stage in any air handling system. They capture coarse dust, lint and insects before they reach the medium and high efficiency stages, protecting the downstream filters and keeping the coil and ductwork clean. GUANLIN frames are rigid, moisture resistant and dimensionally stable, so the pleat pack does not sag or bypass at the frame edge.
Why Choose GUANLIN G4 Paper Frame Filters
- G4 primary efficiency — captures coarse dust and lint to EN 779 G4 standard.
- Rigid moisture-resistant frame — holds shape in humid air handling units without sagging.
- Even pleat spacing — machine pleating keeps airflow uniform and pressure drop predictable.
- Low initial resistance — protects the fan and keeps energy consumption down.
- Standard sizes — 592×592, 287×592, 490×592 and custom dimensions.
- Cost-effective first stage — extends the life of medium and high efficiency filters behind it.
Application Scenarios
AHU and HVAC pre-filtration
Installed as the first stage in air handling units, G4 panels protect coils, fans and downstream bag or HEPA filters from coarse dust loading.
Cleanroom and laboratory supply air
Primary filtration ahead of HEPA stages extends the terminal filter life and stabilises room cleanliness class.
Spray booths and paint lines
Captures overspray and lint before the more expensive medium and high efficiency stages.
Pharmaceutical and food production
First-stage protection for controlled environments where hygiene and filter change frequency matter.
Data centres and telecom rooms
Coarse dust control keeps servers and cooling coils clean with low fan energy penalty.
Industrial ventilation and make-up air
General factory ventilation benefits from a low-cost, high-dirt-holding first stage.
Our Factory
GUANLIN has manufactured filtration products in Dongguan since 2003, operating a 6,000 m² plant with automated filter bag sewing lines, automated singeing equipment, cage welding systems and pleated filter production lines. Products are exported to Singapore, Vietnam, Malaysia and other markets, with ISO 9001 and ISO 14001 certified quality management.
Applicable Working Conditions
- Ambient air, non-condensing
- AHU, HVAC and cleanroom pre-filtration
- Standard frame sizes and custom dimensions
Product Specifications
| Item | Specification |
| Efficiency | G4 (EN 779) |
| Media | Synthetic fibre pleated media |
| Frame | Moisture resistant cardboard / paper frame |
| Standard Sizes | 592×592, 287×592, 490×592 mm |
| Thickness | 21–46 mm |
| MOQ | 50 pcs |
FAQ
Q1. What efficiency is G4?
G4 is a coarse primary efficiency class under EN 779, typically arresting 90% of synthetic dust.
Q2. How often should it be changed?
Typically every 1–3 months depending on dust load; change when pressure drop reaches the final resistance.
Q3. Can you make custom sizes?
Yes, any dimension to your drawing.
Q4. MOQ and lead time?
50 pcs, 10–20 days.
Key Specifications
- Efficiency: G4 (EN 779)
- Media: synthetic fibre pleated
- Frame: moisture resistant paper
- Sizes: 592×592 / 287×592 / 490×592 mm
- MOQ: 50 pcs
