Low-resistance pre-filter paper frame air filter product structure and materials

1. Outer frame material

Made of moisture-proof and water-resistant virgin wood fiber paperboard, possessing high strength characteristics, not easily deformed, cracked, or twisted under normal operating conditions -1-7

The filter media is fixed diagonally at the front and back of the paper frame to ensure a tight bond between the filter media and the outer frame, preventing any airflow leakage -5-7

Common thickness specifications: 20mm (1"), 46mm (2"), 96mm (4"), etc. -2

2. Filter media material

Mainly uses polyester synthetic fiber or non-woven fabric as the filter material -4-9

The filter media undergoes a needle-punching process to form a gradient structure, possessing high dust collection capacity and a long service life -5

Moisture resistance up to 99%, adaptable to high humidity environments -4-5

A metal mesh is bonded to the air outlet surface to prevent vibration and ensure consistent folding spacing -5

3. Structural Design

The filter media is folded and housed within high-strength die-cut cardboard, resulting in a filtration area 2-5 times that of a flat filter.

The folded structure effectively increases the frontal area, ensuring smooth and uniform airflow.

III. Features and Advantages of Low-Resistance Pre-Effect Paper Frame Air Filters

Features and Specific Advantages

Filtration Performance: Filters dust particles larger than 5μm, achieving a gravimetric efficiency of 90%-93%.

Operating Resistance: Initial resistance as low as 18-70Pa (depending on specifications and airflow), saving system energy.

Dust Holding Capacity: Dust holding capacity. .. Large capacity, long service life, reduced replacement frequency -1-2

Strength and robust outer frame, moisture-proof and not easily deformed, ensuring long-term stable operation -1-6

Economical disposable design, no cleaning or maintenance required, low overall operating cost -4-7

Good compatibility and versatility, no need to change the original air conditioning unit design, can be directly replaced -1

Efficiency rating description:

G3 rating: Average efficiency (colorimetric method) 30%-35%

G4 rating: Higher average efficiency (colorimetric method), conforms to EN779 standard -4-6

IV. Technical Performance Parameters

1. Standard Specifications and Performance Parameters - 2-6-8

Actual Dimensions (mm) Thickness Filter Area (m²) Rated Airflow (m³/h) Initial Resistance (Pa) Efficiency Class

595×595×4646mm (2") 1.75 3400 60-70 G3/G4

595×290×4646mm (2") 0.85 1500-1700 45-68 G3/G4

594×594×9696mm (4") 2.66 3400 68 G4

595×595×2020mm (1") 0.88 2380 70 G3/G4

2. Operating Conditions

Recommended Final Resistance: ≤225Pa-2

Moisture Resistance: ≤90%-2

Maximum Operating Temperature: 80°C-4

Recommended Air Velocity: 350FPM (approx. 1.78m/s)-5

V. Application Scenarios

1. Building Ventilation

Primary filtration for air conditioning and centralized ventilation systems-2-8

Pre-filtration for ventilation systems in public places such as office buildings, shopping malls, and airports-6

Filtration for subway ventilation systems-10

2. Industrial and Cleanroom Applications

Pre-filtration for large air compressors-2-8

Dedicated constant temperature and humidity air conditioning for PBX and computer rooms-1-3

Pre-filtration for cleanroom return air systems and FFU inlets-6-10

Pre-filtration before HEPA/ULPA high-efficiency filters to extend the life of downstream high-efficiency filters-1-6

3. Special Applications

Pre-filtration for painting systems and painting workshops-6

Coarse filtration for factory exhaust gas and processing dust collection