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Superior Engineering for Maximum Life

The Pak Bag filter G4 Series Washable is built with advanced materials to ensure it outperforms standard disposable filters:

Thermally Bonded Media: Constructed from high-quality polyester and synthetic fibers. Thermal bonding ensures the media stays intact under high pressure without the use of chemical adhesives that can off-gas.

Sonic-Weld Technology: Each pocket is sonically sealed rather than stitched. This provides maximum structural strength and a 100% leak-free seal, eliminating the “needle-hole” bypass common in lower-quality filters.

Aerodynamic Flow Channels: Internal channels ensure the pockets inflate uniformly. This allows for total media utilization, lower initial pressure drop, and reduced energy consumption for your AHU fans.

Rugged Contaminant Capture: Specifically engineered to remove aggressive pollutants including smoke, fumes, grease, and heavy sand sediment.

Strategic Applications

FAHU & AHU Systems: The perfect pre-filter to protect expensive HEPA stages in hospitals, data centers, and commercial towers.

Ecology Units: Ideal for the primary stage of kitchen extract systems, capturing grease and oil mist effectively.

Clean Room Ventilation: Provides a reliable sterile barrier for pharmaceutical and electronics manufacturing facilities.

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Comparison: Why Choose Pak Bag filter G4 Series Washable?

Feature	Pak Bag filter G4 Series Washable	Standard Synthetic Bag
Maintenance	Washable & Reusable	Single-Use / Disposable
Sealing	Sonically Welded (No Leaks)	Stitched (High Bypass Risk)
Resistance	High (Grease, Sand, Fumes)	Low (Light Dust Only)
Energy Efficiency	High (Aerodynamic Channels)	Moderate (Possible Clumping)
Sustainability	Eco-Friendly / Reduced Waste	High Landfill Impact

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Frequently Asked Questions (FAQ)

1: What are the benefits of a “Washable” G4 Pocket Filter?

A: In regions with high dust or sand (like the Middle East and parts of Asia), filters clog quickly. The Pak Bag filter G4 Series Washable can be washed to restore its pressure drop, significantly extending the time between replacements and lowering your total cost of ownership.

2: Are these Pak Bag filter G4 Series Washable filters ISO 16890 compliant?

A: Yes. Our Pak Bag filter G4 Series Washable is rated under ISO 16890 Coarse filter efficiencies, providing documented performance against large particulate matter (PM₁₀).

3: Can I order custom sizes for my specific FAHU?

A: Absolutely. While we offer standard face dimensions and pocket lengths, K Filter specializes in custom-made filterstailored to your unique equipment requirements.

4: How does the “Sonic Seal” improve my air quality?

A: Traditional stitched filters have thousands of tiny holes where air can bypass the media. Our sonic-sealed pockets are fused together, ensuring every litter of air is filtered—essential for clean room and healthcare applications.

5: Is the media moisture-resistant for tropical Asian climates?

A: Yes. The thermally bonded synthetic fibers are naturally hydrophobic (moisture-resistant) and will not promote the growth of mold or bacteria in humid environments.

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1. How many time I can wash Pak Bag filter G4 Series Washable filters?

Because the Pak Bag filter G4 Series Washable is constructed from high-strength thermally bonded synthetic fibers and sonically welded seams, it is significantly more durable than standard stitched filters.

For users in the Middle East, Africa, and Asia, where sand and dust loads are heavy, here is the guideline for washing and reuse:

The “Rule of 3 to 5”

In a standard industrial or commercial environment, a Pak Bag G4 can typically be washed and reused 3 to 5 timesbefore the microscopic structure of the synthetic fibers begins to “fuzz” or lose its specific filtration efficiency.

Critical Factors for Filter Longevity

The exact number of washes depends on how you clean them and what you are filtering:

• For Sand & Dry Dust (Middle East/Africa): If you are primarily filtering coarse sand from a FAHU, you can often reach the higher end of the limit (5+ washes). Sand sits on the surface and is easily rinsed away.

• For Grease & Oil Mist (Ecology Units/Kitchens): Grease is “sticky.” Removing it requires degreasers. Because chemicals can eventually weaken synthetic bonds, we recommend a maximum of 2 to 3 thorough washes for kitchen applications to ensure fire safety and performance.

• For Urban Smog & Fumes (Europe/Asia): Fine carbon soot (smoke) embeds deep into the fibers. While you can wash the surface, the “internal” pressure drop may stay high. If the filter doesn’t “snap back” to a low pressure after washing, it is time to replace it.

Best Practices for Washing G4 Pocket Filters

To get the maximum number of reuses, follow these K Filter instructions:

• Low-Pressure Rinse Only: Never use a high-pressure power washer. High pressure can tear the sonic seals or create holes in the media. Use a standard garden hose.

• Rinse “Backwards”: Always spray water from the clean air side (the inside of the pocket) toward the dirty air side. This pushes the dirt out the way it came in.

• Use Neutral Detergents: If cleaning grease, use a mild, non-caustic degreaser. Harsh chemicals will break down the thermal bonding of the polyester fibers.

• Complete Drying: Ensure the pockets are fully dry before reinstalling. While synthetic fibers are moisture-resistant, installing a wet filter can cause a massive initial pressure spike and strain your AHU fans.

Q: Does washing the Pak Bag filter G4 Series Washable affect its ISO 16890 rating?

A: With careful washing (up to 3 times), the “Coarse” filtration efficiency remains stable. However, after 5+ washes, the fibers may stretch, slightly reducing the filter’s ability to capture the finest particles. For Clean Room applications, we recommend replacing the filter after 2 washes to guarantee absolute air integrity.

Q: How do I know it’s time to stop washing and buy a new one?

A: If you notice any fraying of the fibers, separation of the sonic welds, or if the pressure drop (ΔP) remains high even after a thorough cleaning, the filter has reached its end-of-life