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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Resource Library

Image of the first page of the Gore Outdoor Cabinet Cooling Filters Data Sheet

Filtration

GORE® Cooling Filters offer the most efficient and reliable cooling technology available for outdoor electronic enclosures. Unlike closed loop systems like AC and HEX, GORE Cooling Filters enable the use of DAC by providing critical environmental protection – allowing you to take full advantage of natural thermal efficiency of 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 reliable cooling technology

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.

About direct air cooling (DAC) technology with GORE® Cooling Filters

GORE® Cooling Filters offers the most efficient and reliable cooling technology available for outdoor electronic enclosures. Unlike closed loop systems like AC and HEX, GORE® Cooling Filters enable the use of DAC by providing critical environmental protection – allowing you to take full advantage of natural thermal efficiency of air.

Increase system reliability with GORE® Cooling Filters

Gore‘s standard product line of Cooling Filters offers unique sizes that incorporate the high performance Gore filtration media into a lightweight, durable ABS polymer frame. The product offering can be integrated into a variety of enclosure designs in order to reduce weight and cost.

Cooling Filters

Benefit from our application expertise and experience

With sales and market experience of more than 15 years and several hundred thousand GORE® Cooling Filters deployed globally, Gore has gathered unparalleled in-depth application knowledge. Based on global field testing under various climatic conditions we are in the position to provide our customers with realistic lifetime modeling projections that help to minimize maintenance uncertainties.

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 IP65 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.

Part Number Filter Attributes Filter Performance
Height (mm) Width (mm) Depth (mm) Weight (kg) Maximum Air Flow (m3/hr) Equivalent Heat Dissipation Capacity (W) 1 New Filter Pressure Drop (ΔP) vs. Airflow (Q) Curves
CF541163 692 500 48 2.7 500 1613 ΔP (Pa) = 0.11 x Q (m³/h)
CF541211 200 345 90 1.2 162.5 524 ΔP (Pa) = 0.34 x Q (m³/h)
CF541237 605 454.5 57.2 2.2 450 1452 ΔP (Pa) = 0.12 x Q (m³/h)
CF541238 455 305 57.2 1.2 200 645 ΔP (Pa) = 0.28 x Q (m³/h)
CF541239 305 230 57.2 0.7 100 323 ΔP (Pa) = 0.56 x Q (m³/h)
CF541242 605 455 80 3.3 625 2016 ΔP (Pa) = 0.09 x Q (m³/h)
CF541252 305 455 57.2 1.2 212.5 685 ΔP (Pa) = 0.26 x Q (m³/h)
CF541257 494 440 57.4 1.9 337.5 1089 ΔP (Pa) = 0.17 x Q (m³/h)
CF541258 850 440 57.2 3.0 625 2016 ΔP (Pa) = 0.09 x Q (m³/h)
CF551278 205 440 80 1.2 187.5 605 ΔP (Pa) = 0.30 x Q (m³/h)
CF551279 440 440 80 2.4 450 1492 ΔP (Pa) = 0.12 x Q (m³/h)

 

1 Assuming ΔT of 10 °C

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

Product & Design

Frame ABS Black
Membrane Hydrophobic ePTFE
Pleated Filter Media Fully Synthetic Composite
Potting Polyurethane
Gasket Polyurethane Foam/Thermoplastic Elastomer

 

Operating Temperature –40 to +65 °C
Humidity Range 0 to 99.5% RH
Filtration Efficiency > 99.5% (@ 0.1 μm, 1 cm/sec)
Filtration Class EN1822 – E12
Flammability UL 900
Typical Filter Lifetime Up to 5 years (based on application)2

 

2 Installation location impacts PM10 air pollution assumptions used in lifetime projections

Telecommunications Industry Standards
Ingress Protection Testing Wind Driving Rain Testing Flammability Testing
Filter protection against ingress of particulates and water   Resistance to open flame
METHOD:
  • IEC 60529
RATING:
  • IP653
METHOD:
  • GR 487-CORE
    Comply with the 31 m/sec
    [70 mph] 3
METHOD:
  • UL 900
Salt Fog Testing Filter Attributes
Filter resistance to salty environments  
METHODS:
  • GR 487-CORE
    Passed the 30 day continuous salt fog test 3
  • IEC 60068-2-52
    Passed cyclic salt fog Test Method 3 3
METHOD:
  • GR-487-CORE
    (3% H2SO, 0.2N NaOH, NH3 , 90% IPA, Kerosene,
    10% Igepal CO 630, WD40, Cable Filling Compound, Splice Encapsulating Compound,
    Wasp and Hornet Spray)

3 Enclosure test; filter supports this performance when installed in sealed enclosure with louver protecting filter

Resources

FOR INDUSTRIAL USE ONLY

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