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⚡ HAF Technology · Factory Direct OEM/ODM

High-Airflow Electrostatic HAF Filters | Factory-Direct OEM/ODM

30+ Years of Manufacturing Excellence in Nantong, China. Delivering Maximum Dust-Holding Capacity with Minimal Pressure Drop for HVAC, Marine, and Industrial Ventilation Systems.

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33+
Years Manufacturing
53
Authorized Patents
50+
Export Countries
ISO
9001 & 14001
Custom HAF air filter manufacturer - Deli Purification — corrugated open-channel electrostatic PP media for HVAC and marine OEM
<25 Pa Initial Resistance
at 2.5 m/s
Why HAF Technology

Why Choose Deli's HAF (High Airflow Filtration) Technology?

Unlike traditional micro-fiber media that cause high resistance and early clogging, Deli Purification's HAF filters utilize a permanent electrostatic open-channel structure engineered for sustained high-volume airflow with superior particle capture — not a trade-off between the two.

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Open-Channel Corrugated Design

Micro-structured corrugated channels allow air to flow freely while creating controlled turbulence that brings particles into direct contact with channel walls — maximizing interception without restricting airflow.

⚡

Permanent Electrostatic Charge

The polypropylene (PP) media is injected with a permanent electrostatic charge during the extrusion process. This charge actively attracts, captures, and retains airborne particulates down to sub-micron levels — a mechanism that does not degrade with normal use.

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Double the Efficiency, Half the Resistance

Provides twice the dust-holding capacity of conventional filters of the same thickness, while maintaining an exceptionally low initial pressure drop below 25 Pa — directly reducing fan motor energy costs in HVAC systems.

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Hydrophobic, Rot-Resistant Media

100% polypropylene construction with 100% RH resistance. Does not swell, deform, or rot under sustained moisture exposure — essential for marine, offshore, and high-humidity industrial installations.

Air Flow → ╔═══╗ · ╔═══╗ · ╔═══╗
║ ║ ║ ║ ║ ║
⚡ Charge → ║ ~ ║ ⊕ ║ ~ ║ ⊕ ║ ~ ║
║ ║ ║ ║ ║ ║
Clean Air ← ╚═══╝ · ╚═══╝ · ╚═══╝

⊕ = Captured Particulate
~ = Turbulence Zone
Channels: Open airflow path
≥90%
Efficiency at 3.0μm
@ 2.5 m/s face velocity
<25 Pa
Initial Resistance
(standard conditions)
450 g/m²
Max Dust Capacity
(45mm thickness)
2×
Service Life vs.
conventional mesh filters
Technical Data

Technical Specifications & Performance Data

Industrial-grade parameters — no vague descriptors. Every value is measurable, testable, and reproducible across production batches.

Parameter Specification / Value Testing Standard / Notes
Base Material 100% Electret Polypropylene (PP) Recyclable; split-resistant; halogen-free
Structure Type Corrugated Open-Channel Matrix Optimized for low-resistance aerodynamics and turbulent particle interception
Standard Thicknesses 10 mm · 20 mm · 25 mm · 45 mm Customizable to any dimension based on buyer drawings or samples
Filtration Efficiency ≥ 90% for particles ≥ 3.0 μm Tested at 2.5 m/s face velocity per industrial filtration protocol
Initial Resistance < 25 Pa (at 2.5 m/s face velocity) Reduces energy consumption of fan motors in HVAC installations
Dust Holding Capacity 220 g/m² – 450 g/m² (thickness-dependent) Up to 2× service life compared to equivalent woven mesh filters
Max Operating Temperature 80 °C (176 °F) Stable in high-temperature HVAC and industrial environments
Moisture Resistance 100% Relative Humidity Hydrophobic PP; completely rot-resistant; suitable for marine installation
Flame Retardancy UL 900 Class 2 / DIN 53438 F1 Compliant with US and European international safety codes
Electrostatic Charge Permanent — injected during PP extrusion Non-washable; charge persists throughout rated service life under dry conditions
Frame Options No frame · Cardboard · Aluminium · Galvanized steel OEM packaging and private labeling available
Compliance RoHS · REACH (no SVHC > 0.1% w/w) Documentation available; CE marking support for EU importers
MOQ 500 pieces (standard); flexible for custom sizes Contact us to discuss volume and first-order terms
Sample Lead Time 7 – 10 business days Shipped worldwide by DHL / FedEx / UPS
Bulk Production Lead Time 15 – 30 days Depending on quantity and custom specification complexity
All parameters are batch-verified. Every shipment undergoes fractional efficiency and pressure drop testing on automated filtration test equipment before dispatch. Third-party inspection (SGS, BV, TÜV) welcome on any order.

Open-Channel Structure & Electrostatic Charge Technology vs. Conventional Micro-Fiber Media

A quantified, side-by-side comparison of where Deli's HAF electrostatic open-channel media outperforms conventional dense micro-fiber filters — the two metrics that matter most to HVAC and industrial buyers: dust holding capacity and airflow resistance.

Performance Metric Deli HAF Filter (Open-Channel + Electrostatic) Conventional Micro-Fiber Filter
Capture Mechanism Electrostatic charge + open-channel turbulence interception Mechanical barrier (dense fiber density) only
Airflow Resistance (Initial) <25 Pa at 2.5 m/s — exceptionally low 50–100 Pa — high resistance restricts airflow
Dust Holding Capacity 220–450 g/m² — up to 2× capacity 110–220 g/m² — clogs faster
Service Life (same conditions) Up to 2× longer before replacement Baseline — shorter cycle
Fan Motor Energy Cost Lower — minimal pressure drop reduces load Higher — fan works harder against resistance
Sub-Micron Particle Capture Yes — electrostatic attraction down to sub-micron Limited — depends purely on physical pore size
Performance as Filter Loads Maintains airflow as channels capture particles Airflow drops sharply as pores clog
Moisture / Marine Suitability Hydrophobic PP, 100% RH resistant, rot-proof Often cellulose-based — degrades in humidity
Applications

Where Deli HAF Filters Perform

Four distinct market segments where the open-channel electrostatic structure delivers measurable performance advantages over conventional alternatives.

⚓

Marine & Offshore Ventilation

Resistant to sea salt spray and 100% relative humidity. Ideal for ship cabin HVAC systems, offshore platform ventilation, and marine engine room air intakes where filter breakdown, swelling, or corrosion is not an option. The hydrophobic PP media does not absorb salt water and will not rot or delaminate over extended voyages.

Salt Spray Resistant
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Commercial HVAC Systems

Perfect for high-velocity air handling units in hospitals, shopping malls, office buildings, and data centers. Low initial resistance (<25 Pa) directly reduces fan motor energy consumption — translating to measurable OPEX savings at scale. Suitable as pre-filtration or primary filtration depending on application requirements.

Energy-Efficient
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Industrial Equipment Protection

Pre-filtration media for telecommunications enclosures, power generation units, CNC machinery air intakes, and heavy industrial equipment cooling systems. The open-channel structure maintains airflow even as particulate load increases — protecting sensitive equipment without restricting cooling airflow.

High Dust Capacity
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Home Appliance OEM

High-efficiency replacement media for premium air purifiers, dehumidifiers, and HVAC-integrated humidification systems. Suitable for white-label OEM programs targeting North American, European, and Japanese consumer appliance brands. Custom cut-to-size available with private label packaging.

OEM / Private Label
Why Deli Purification

Verified Manufacturing Credentials

Objective facts. No marketing claims that cannot be documented. Every credential listed below is verifiable on request.

1993

33-Year Industrial Legacy

Nantong Deli Purification Material Factory was established in 1993 and operates a 15,000+ m² facility dedicated strictly to air filtration media and custom replacement components. Continuous operation through three decades of evolving HVAC and filtration standards.

53

Authorized Patents

Backed by 53 national invention and utility patents covering proprietary media performance, corrugated open-channel construction, and structured rigidity methods. Patent documentation available to qualified OEM buyers under NDA.

Tier 1

Global Supply Chain Partner

Long-term OEM/ODM partner for industry leaders including Gree Electric (Fortune 500, China's #1 A/C manufacturer), Freudenberg Performance Materials (global industrial filtration leader), and Philips (designated supplier for air purifier filtration components).

ISO

International Certifications

ISO 9001:2015 (Quality Management) and ISO 14001:2015 (Environmental Management), both certified since 2005 with annual third-party audits. Bureau Veritas audit certificate no. 25MIC-ASR2541690. All materials pass RoHS and REACH compliance testing.

100%

Batch-Level Quality Control

Every batch undergoes fractional efficiency and pressure drop testing on automated filter test equipment before dispatch. Third-party inspections by SGS, TÜV, BV, or buyer-nominated agencies are welcome on any order — we have nothing to hide.

50+

Export Markets Served

Active distribution to the USA, UK, Germany, Australia, Japan, and 45+ other countries. References and existing customer testimonials available to serious OEM prospects under appropriate commercial context.

Get a Quote

Partner with a Proven Chinese Filtration Factory

Whether you need standard 25mm HVAC rolls, custom marine-grade configurations, or private-label home appliance components, Deli Purification delivers high-volume production with tight dimensional tolerances and batch-verified performance data.

  • Custom dimensions from buyer drawings or physical samples
  • Free samples in 7–10 business days, shipped DHL/FedEx worldwide
  • ISO 9001 batch test reports included with every shipment
  • MOQ 500 pieces; flexible for initial qualification orders
  • Third-party inspection welcome on all orders
  • RoHS, REACH, CE documentation available for EU importers

Request a Bulk Quote or Free Sample

Our technical sales team responds within 12 business hours (GMT+8).

FAQ

Frequently Asked Questions

Technical and procurement questions from HVAC engineers, OEM buyers, and filtration system integrators.

What is the filtration principle of Deli's HAF air filters? +
Deli's HAF (High Airflow Filtration) filters utilize an electrostatic corrugated PP (Polypropylene) open-channel structure. Unlike mechanical barriers, it uses localized electrostatic charges to attract and capture airborne particulates, delivering high efficiency while maintaining a minimal pressure drop (low airflow resistance). The permanent charge is injected into the media during the PP extrusion process, so the capture mechanism does not rely solely on physical density — this is what allows the filter to achieve ≥90% efficiency at 3.0μm while keeping initial resistance below 25 Pa.
Can Deli's HAF filters be customized for marine applications? +
Yes. Nantong Deli Purification manufactures custom-dimension HAF air filters specifically engineered with hydrophobic polypropylene media to withstand high humidity and salt spray in marine and offshore HVAC systems. The 100% PP construction resists moisture absorption, does not rot or swell, and maintains structural integrity under sustained exposure to 100% relative humidity — conditions that destroy cellulose-based filter media. Custom dimensions, frame materials (aluminium, galvanized steel, plastic), and corrosion-resistant packaging are available.
Is Deli Purification capable of high-volume OEM for global brands? +
With over three decades of factory experience since 1993, Deli Purification operates high-speed automated production lines that supply custom air filter components directly to global consumer electronics and industrial brands including Philips and Freudenberg. Backed by 53 authorized national patents and ISO 9001:2015 certification with annual Bureau Veritas audits (no. 25MIC-ASR2541690), Deli operates as a Tier 1 OEM partner capable of supplying consistent quality at scale across 50+ export markets.
What is the difference between HAF filters and conventional HVAC filter media? +
Conventional micro-fiber or pleated HVAC filters use dense media that creates high initial resistance and clogs rapidly as particulate accumulates — both increasing fan energy consumption and reducing service life. Deli's HAF (High-Airflow) filters use a corrugated open-channel structure where micro-structured channels allow air to flow freely while turbulence brings particles into contact with channel walls. A permanent electrostatic charge injected during PP extrusion actively attracts and retains sub-micron particulates. The result: initial resistance below 25 Pa (versus 50–100 Pa for comparable dense media), dust-holding capacity of up to 450 g/m², and service life up to 2× that of conventional woven mesh filters.
Where can I source HAF electrostatic filter media in bulk for HVAC OEM? +
Nantong Deli Purification Material Factory (南通得力净化器材厂) is a direct OEM manufacturer of HAF electrostatic air filter media located in Nantong, Jiangsu, China. Established 1993. ISO 9001:2015 and ISO 14001:2015 certified. 53 national patents. MOQ 500 pieces. Free sample delivery in 7–10 business days. Custom dimensions accepted from buyer drawings or physical samples. All materials are RoHS and REACH compliant with CE marking support available for EU importers. Contact: amanda@ntdeli.top or WhatsApp +86-138-6296-0263.
What certifications do Deli Purification HAF filters hold? +
Deli Purification HAF filters are manufactured under ISO 9001:2015 (Quality Management) and ISO 14001:2015 (Environmental Management), both certified since 2005 with annual third-party audits by Bureau Veritas (certificate no. 25MIC-ASR2541690). Flame retardancy is certified to UL 900 Class 2 (USA) and DIN 53438 F1 (Germany/EU). All filter materials pass RoHS and REACH compliance testing (no restricted heavy metals; no SVHC above 0.1% w/w). SGS or TÜV lab reports can be arranged for OEM qualification testing on request.
What is the dust-holding capacity of Deli HAF filters versus standard mesh filters? +
Deli HAF filters achieve 220–450 g/m² dust holding capacity depending on media thickness (10mm to 45mm). Standard woven mesh filters of equivalent thickness typically achieve 110–220 g/m² — half the capacity. This means HAF media provides up to twice the service life in the same installation space, reducing maintenance frequency and total cost of ownership. For high-particulate industrial environments, the 45mm variant at 450 g/m² is recommended.
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