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WR (Weather Resistant) Filters

Protection from dust, water, and salt fog ingress with low initial resistance

Universal Air Filter’s WR (Weather Resistant) Filter solution delivers outstanding protection for electronics enclosures deployed in harsh outdoor environments, allowing designers to utilize ambient air to cool vented systems, increasing efficiency and reducing operating costs compared to closed systems with limited heat dissipation capacity. Custom UAF WR (Weather Resistant) Filter solutions limit ingress of dust, water, and salt fog into electronics enclosures using fresh air intake and direct air-cooling systems instead of costly, inefficient, closed-loop heat exchangers. This is an ideal solution for outdoor video displays and kiosks, power generation, EV chargers, security, military/defense, telecom, and any other industrial or commercial outdoor enclosures installed in harsh environments.

The UAF WR (Weather Resistant) Filter was developed with a unique 2 stage approach to the different aspects of filtration required for outdoor environments using an open-cell polyurethane foam pre-filter with a treated hydrophobic mesh layer to capture coarse dust particles and knock down the majority of the potential water ingress and high-efficiency primary filter to capture fine dust and airborne water droplets.

The UAF WR (Weather Resistant) Filter solution is designed to provide superior water and airborne contaminant protection in compliance with stringent industry standards including GR 487, NEMA, IP, MIL-STD-810E enclosure standards that is RoHS compliant and UL900 rated. UAF developed the WR Filter to achieve the same level of equipment protection as other comparable high-efficiency filters with much lower initial resistance, effectively allowing our customers to achieve significant cost savings through decreased power consumption and longer filter life. 

In addition to WR (Weather Resistant) Filters, Universal Air Filter Company also manufactures several other air filtration solutions for use in outdoor environments.

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Applications

Power Gen Air Filters

UL 900
UL 94 HF-1
UL 1248
UL 1778
UL 2200
EU1-EU4

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Industrial Air Filters

UL 900
UL 94 HF-1
CE (EN 60950)
EU1-EU4e

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Military Air Filters

MIS 20189E
MIL-STD-285
MIL-STD-461
MIL-STD-810
MIL-S-901
MIL-STD-167
FIPS 140-1
FAR 25.853 / 25.855
DIN 53438

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Technical Specifications

The UAF WR (Weather Resistant) Filter solution utilizes a high efficiency primary filter in combination with a cleanable pre-filter. Each filter uses a urethane gasket to provide a watertight seal.  A cleanable/ replaceable foam pre-filter assembly is installed upstream of the primary filter. This 2-stage filtration solution offers a high-level of protection for outdoor enclosures by allowing higher air flow and lower initial resistance compared to other outdoor enclosure filter solutions. The WR Filter solution provides protection against dust, water, and salt fog ingress to meet stringent industry standards, IP54 and Telcordia NEBS GR-487 (salt fog). It offers similar water ingress and salt fog protection as other filters employing membrane technology, but at less cost and up to 25% lower initial resistance. Model WR Filters meet industry compliance standards for RoHS/REACH and UL flammability. The WR Filter can be custom designed to fit the unique enclosure characteristics and the environment of deployment by one of UAF’s protection specialists/engineers.

Extruded Channel Frame: +/- 0.06″ length & width, +/- 0.03″ thickness

The WR pre-filter utilizes a 2-stage approach, consisting of an open-cell polyurethane foam filter media and an engineered polyester (PET) mesh.  The foam media is installed on the upstream side of the pre-filter and provides a low resistance means of capturing coarse dust particles while effectively decreasing the force of strong water jets directed at the filter.  The PET mesh is installed on the downstream side of the pre-filter and is PTFE coated for moisture resistance.  The WR primary filter provides a third stage of protection using a pleated, synthetic, MERV 15 media sealed in an aluminum frame to provide protection from fine dust particles and small amounts of water that may pass through the pre-filter.  This combination of media solutions provides an exceptional level of equipment protection for direct air cooled or convection vented outdoor enclosures.  Ratings as high as IP54 are achievable without the use of louvers, dependent upon your cabinet design.

The WR (Weather Resistant) Filter solution uses an aluminum frame for both the pre-filter and primary, both available with water sealing closed-cell foam gaskets. A RoHS compliant chemical conversion coating can be added for corrosion protection of aluminum materials. The Model WR Filter solution is available in nearly any width and length (up to 24” x 48”) in standard, 2” and 3” nominal thicknesses (1.63” and 2.63” actual). Custom thicknesses are also available.  For certain applications, drain holes can be added to the pre-filter frame so water exits quickly.

UAF WR Filter solutions can help to meet the following enclosure ratings:

IP Ratings: IP54

NEMA Ratings: NEMA 3, NEMA 3R, NEMA 3S, NEMA 4, NEMA 12

Telcordia GR-487-CORE (Salt Fog)

Compliant to UL900, RoHS, and REACH

Helps meets the following enclosure ratings: IP54 and NEMA 4, GR-487, MIL-STD-810E (Sand and Dust)

Efficiency, IP Rating and Salt Fog

Primary Filter: MERV 15

Pre-Filter:  91% Average Dust Arrestance (Est. MERV 7)

UAF’s WR (Weather Resistant) Filters have been tested and certified to meet IP54 without the aid of mechanical protection of any kind, including louvers, hoods, or screens in a typical outdoor enclosure implementing direct-air cooling. Several customers have exceeded IP54 ratings by adding mechanical protection to their WR filter-protected enclosures.

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UAF’s WR Filters have passed a 30-day salt fog test using a 5% salt fog concentration per ASTM B-117 in accordance with GR-487-CORE, Issue 5.  The WR Filter provided an 85% reduction in corrosion cause by salt fog exposure.  The aluminum frame material can be coated with a RoHS compliant chemical conversion finish for addition corrosion protection of aluminum components.