Ambient Air Filters for Outdoor Cabinets

GORE® Cooling Filters provide years of maintenance-free life while enabling the cooling of sensitive electronics with ambient air without the risk of corrosion from airborne contaminants.

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+1 800 231 4364

Europe

+49 89 4612 2211

Korea

+82 2 393 3411

China

+86 21 6247 1999

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+55 11 5502 7800

Resource Library

Outdoor Cabinet Cooling Filters Data Sheet

Particle and Gas Filtration for Industrial Processes & Bag Houses

Unlike closed loop systems such as AC and HEX, GORE Cooling Filters enable the use of direct air cooling by providing critical protection from water, corrosive salts and other airborne contaminants – allowing you to take full advantage of the natural thermal efficiency of ambient air.

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All Resources For Ambient Air Filters for Outdoor Cabinets

Overview

GORE® Cooling Filters enable you to lower your system costs by taking full advantage of the natural thermal efficiencies of ambient air. Our filters protect your equipment from harmful contaminants and corrosives for several years while requiring no regular maintenance.

High reliability cooling for electronic enclosures

Unlike large, energy consuming, active cooling systems, GORE Cooling Filters enable you to take full advantage of the natural thermal efficiencies of ambient air while simultaneously lowering your system costs. GORE® Direct Air Cooling Filters are smaller and have fewer parts than bulky HEX and AC units. This reduces space usage and simplifies maintenance.

Enabling Ambient Air Cooling

Introducing the most efficient, cost-effective cooling technology available for outdoor electronic enclosures: Cooling Filters from W. L. Gore & Associates. Unlike closed loop systems like AC and HEX, GORE Cooling Filters enable the use of direct air cooling by providing critical contamination protection – allowing you to take full advantage of the natural thermal efficiency of ambient air.

Gore’s Filtration Advantage

Inside the GORE Cooling Filter is the latest generation of our unique microporous membrane. Pioneered by Gore in 1973 for use in critical industrial applications, this durable, efficient membrane stops water and corrosive particles from passing through, yet remains highly permeable to air.

Cooling Filters

Ideal for a Variety of Challenging Applications

GORE Cooling Filters can be used directly in place of heat exchangers (HEX) or air conditioning (AC) systems, or in conjunction with AC to help reduce operational costs. Hundreds of thousands of base stations depend upon GORE Cooling Filters for maintenance-free cooling performance. Our deployments span the globe, and have proven successful under extreme ambient operating conditions, including: salt air, wind-driven rain, heavy industrial pollution and high temperature.

Features & Benefits

Direct air cooling reduces the high capital and operating cost of heat exchangers and air conditioning

Direct air is one of the most efficient cooling methods available. When combined with high efficiency membrane filters it offers thorough protection from salt, dust, water and other contaminants...

Cooling Filters Thermal Efficiency Graph

Improves Thermal Efficiency

  • No thermal transfer loss
  • Better Watts/K Cooling Capacity
  • More uniform airflow through cabinet
  • Directs airflow to hotspots
  • Wider temperature deployment range
Features and Benefits Operational Cost

Lower Operational Costs

  • Uses less energy than air conditioning systems
  • Requires less maintenance
  • Significantly improves MTBF
  • Reduces space rental costs
Cooling Filters Capital Expenses Graph

Lower Capital Expenses

  • Cost much less than air conditioning
  • Reduces back-up energy requirements
  • Simplifies component placement
Cooling Filters Smaller Size and Less Noise Graph

Smaller Size and Less Noise

  • Takes up less space
  • Lower weight reduces transportation and installation costs
  • No external fans for lower noise emissions

Direct air is one of the most efficient cooling methods available. When combined with high efficiency membrane filters it offers thorough protection from salt, dust, water and other contaminants. This results in the most reliable and cost-effective protection for your sensitive electronics. GORE Cooling Filters technology enables direct air cooling by providing critical contamination protection while still allowing high airflow. Unlike bulky heat exchangers or costly air conditioning systems, GORE Cooling Filters let you benefit from the thermal efficiency of ambient air while reducing capital and operational costs.

GORE Cooling Filters increase reliability and lower costs

Our unique expanded polytetrafluoroethylene membrane’s microporous surface provides E11/12 particle filtration efficiency according to EN1822 yet still allows high flows of cool, clean air to pass through to system electronics.

High efficiency membrane protects from even submicron particles. Our unique expanded polytetrafluoroethylene membrane’s microporous surface provides E11/12 particle filtration efficiency according to EN1822 yet still allows high flows of cool, clean air to pass through to system electronics.

Protects against Salts and Corrosive Particles. GORE Cooling Filter’s inert membrane surface easily screens out damaging salt sprays, and other corrosives. This ensures longer life for system electronics and cabinetry.

Water Tight Construction. The filter's hydrophobic membrane surface, anodized aluminum or ABS frame, and a tightly designed peripheral sealing system eliminate any ingress of water. It provides long term protection and easily meets IP55 requirements.

High Durability, Lower Opex Costs. Besides their low initial costs and small size, GORE Cooling Filter’s ruggedized construction and fewer replacement parts also leads to significant reductions in ongoing maintenance and service costs. No matter which GORE Filter you choose for your Base Station, Switching, or Power system, our applications team will ensure the most operationally efficient cooling solution.

Why use membrane cooling filters versus non-membrane filters?

Reliable protection of system electronics requires highly efficient filtering of ambient air to remove submicron particles and aerosols while also preventing water ingress into the cabinet. This is best achieved by using membrane filter media, which provides 99% particle filtration efficiency at the 0.3um level yet still allows high airflows. Not only do membrane filters eliminate costly failures caused by corrosion and other pollutants, but they are also maintenance free and have longer lifetimes than non-membrane alternatives.

Unlike conventional non-membrane filters, GORE Cooling Filters have been specifically developed for outdoor cooling and protection under extreme environmental and climatic conditions. GORE™ Membrane filters comply to all relevant telecom industry regulations. They are tested for water-tightness and achieve IPX5 grade protection without requiring special louvers. They offer HEPA H11/12 class filtration even for submicron particle sizes. GORE Cooling Filters are maintenance-free and optimized for longest possible lifetime

Membrane Filter (500X SEM)

Membrane Filters

GORE expanded PTFE membrane’s microporous structure provides higher filtration efficiency

Non-Membrane Filter (500X SEM)

Non-Membrane Filter

The open structure of non-membrane filters lets dust and small particles pass right through into cabinet

Engineering & Support

Fan Control

Typical initial resistance of a Gore Cooling Filter is between 50-100 Pa and increases over its life time up to 200-250 Pa. In addition to this the resistance of the electronic fan has to be considered. Radial fan airflow/pressure characteristics typically operate in this same range. Both forward or backward curved impellers are available. Forward curved impellers require special housing, backward curved impellers only require a box. Both radial fan types should be placed behind the filter to protect them from ambient contaminants.

The fans should be set to ensure minimum temperature fluctuation within specified ranges. Control of the internal temperature is influenced by many variables including: ambient temperature, solar radiation, heat load and filter resistance. These variables are addressed by using fan control logic that offers either simple speed control or advanced (thermostatic) features depending on system requirements.

Gore Applications Engineers can help you to select the appropriate fan type and position to optimize the life of your electronics and filter.

Cooling Filter Fan Control Chart
Filter Sealing

To ensure a good sealing between cabinet and GORE Cooling Filter we include an integrated polyurethane foam gasket which is approved for environmental sealing.

Design and Mounting Considerations

Installing the GORE Cooling Filter to a cabinet door can be easily performed either by using mounting brackets or mounting frames as illustrated in the following. For optimum performance it is recommended to orient the pleats vertically.

Cooling Filter Sealing

In order to securely seal the cabinet it is critical to assure a consistent compression of the gasket. For further design and mounting recommendations specific to your application please contact a Gore specialist.

Cooling Filter Sealing
Performance Characteristics

For additional technical information and support, please contact Gore.

GORE Cooling Filter
Part Number
Dimensions HxWxD (mm) Maximum Peak Airflow
(m3/h)/CFM
Equivalent Heat Dissipation (W)
CF541239 305 x 230 x 57 75/44 300
CF541238 455 x 305 x 57 145/85 600
CF541237 605 x 455 x 57 315/185 1300

 

Global Pollution Map

The environmental conditions in locations chosen for deployment of Telecom outdoor base stations are highly variable. Seashore, industrial areas, mega-cities, arctic regions, forests, deserts and other extreme spots burden the ambient air with particles of different natures and origins: road dust, diesel exhaust, hydrocarbon particles, corrosive salts, pollen, sand and many other kinds of contaminants that cannot be clearly defined. Even highly sophisticated computer simulation or laboratory testing cannot adequately predict long term behavior of filters used for ambient air filtration.

Estimated PM10 Concentrations in World Cities Having More than 100,000 People

Global Pollution Map

Urban Outdoor Particulate Air Pollution: New Estimates; K. Pandey et al. Development Economics Research Group & The Environment Department, The World Bank (2004)

Global Field Testing / Theoretical Lifetime Modelling

The environmental conditions in locations chosen for deployment of Telecom outdoor base stations are highly variable. Seashore, industrial areas, mega-cities, arctic regions, forests, deserts and other extreme spots burden the ambient air with particles of different natures and origins: road dust, diesel exhaust, hydrocarbon particles, corrosive salts, pollen, sand and many other kinds of contaminants that cannot be clearly defined. Even highly sophisticated computer simulation or laboratory testing cannot adequately predict long term behavior of filters used for ambient air filtration.

Therefore, Gore has deployed many test cabinets with our filters in extreme environments around the globe in order to accumulate data that characterize the behavior of our products under real life conditions. The valuable field data allows modelling of lifetime under various environmental conditions, and enables Gore to develop the most advanced filtration media for ambient air filtration.

GORE Cooling Filters are the only air filters which are optimized for ambient air filtration and their operation lifetime at various pollution levels can be realistically approximated by a theoretical model supported by a broad base of real life data.

Global Test Locations

In order to ensure fitness-for-use, our global field test program was implemented to evaluate the performance of GORE Cooling Filters in real-world environments.

Global Test Locations

In order to ensure fitness-for-use, our global field test program was implemented to evaluate the performance of GORE Cooling Filters in real-world environments. Various test locations around the world were chosen in order to compare the lifetime of filters in different air pollution environments. With this research we were able to validate theoretical models with global empirical data collected from the field test units.

Compatible Technologies
  • MCPAs
  • Base Band Units
  • Remote Radios
  • Power Cabinets
  • Battery Backup Units
  • Switching Systems
Global Engineering Support

Asia

Gore Industrial Products
Trade Company
43 F United Plaza
1468 Nanjing Road West
Shanghai, 200040
Phone: +86 21 6247 1999
Fax: +86 21 6247 9199

Europe

W. L. & Associates GmbH
Herrmann-Oberth-Strasse 26
D-85640 Putzbrunn. Germany
Phone: +49 89 4612 2211
Fax: +49 89 4612 2300

North America

W. L. Gore & Associates, Inc.
101 Lewisville Road
Elkton, MD 21921
Phone: +1 410 392 3300
Fax: +1 410 398 6624

Product & Design

Temperature Range: -40°C to +65°C
Humidity: 0 to 100% RH
Typical Initial dP: 50 - 100 Pa
Typical Final dP: 200 - 250 Pa
Typical Filter Lifetime: 3 - 5 Years
Filter Efficiency: 99% (@ 0.3 μm and larger particles, 1 cm/sec)

 

Frame: ABS Polymer
Filter Media: Microporous Expanded
Polytetrafluoroethylene (ePTFE)
Membrane with Non-Woven support
Potting: Polyurethane
Gaskets: Closed Cell Polyurethane

 

Telecommunications Industry Standards

IEC 605629 Degrees of protection provided by enclosure

According to the conditions and requirements set forth in IEC605629, our filters provide sufficient protection to enable the cabinet to achieve an IP55 rating.

GR 487-CORE Generic Requirements for Electronic Equipment Cabinets Wind-driven rain Cabinets fitted with GORE Cooling Filters have been found to comply with the 70mph wind-driven rain requirements per GR-487.

GR-487-CORE Generic Requirements for Electronic Equipment Cabinets Salt Fog Cabinets fitted with GORE Cooling Filters have been able to pass the 30 day continuous salt fog test with proper door and cabling seals.

NEMA 250 Cabinets can achieve a NEMA 3R rating with a GORE cooling filter when properly mounted for vandalism protection

IEC 68-52-2 Salt Fog Test Cabinets filled with GORE Cooling Filters have been tested and pass cyclic salt fog Severity Level 3 as per IEC 60068-52-2 Environmental Testing.

UL 900 Air Filter Units Our filters have been tested and pass according to the UL 900 Air Filter Units flammability standard for flame propagation and smoke generation. Our filters achieve the highest possible rating.

Resources

FOR INDUSTRIAL USE ONLY

Not for use in food, drug, cosmetic or medical device manufacturing, processing, or packaging operations