Nov 1, 2012 — Thanks to Universal Air Filter’s expanding, one-piece assembly unit, which includes a filter, mounting bracket, fan guard and air flow plenum, design engineers or end-users no longer need to specify multiple parts to serve the same function. Clients also can install the air filter media quickly without complex installation kits and procedures.
To ensure a prompt mount of the assembly, Universal Air Filter® can match an existing hole pattern or provide captive fasteners and high-bond adhesive tapes. In addition, UAF offers special metal finishes to match existing enclosures and/or provide protection in corrosive indoor or outdoor environments. Filters withQuadrafoam media also provide an additional layer of protection for flammability, ultraviolet light, hydrolytic stability and fungus resistance.
“This product offers our clients an integrated and effective solution to housing air filter media,” said Mike Miano, engineer and sales manager at UAF. “It speeds up assembly in production applications and allows clients the ease of installation in the field.”
The low-profile assembly unit can be used for new design or field retrofit and can be configured to meet UL and/or other safety standards for finger and tool probe safety tests.
In addition to the numerous indoor equipment applications, products residing outside could require protection from an unexpected source of contamination. Due to the wide variety of geographical installations in outdoor environments, equipment not originally containing a filter may need some form of filtration at an air intake vent. Universal Air Filter offers an easy solution.
“We have seen an increase in filters and screens to reduce ingress of harmful water or other airborne contaminants,” said Miano. “We can provide something as simple as a thin filter or screen with a hole pattern or high-bond adhesive tapes for quick, reliable field installation. For example, we can supply a screen to keep cottonwood seed from loading the inside of an outdoor rooftop or roadside enclosure.”
A design engineer looking to evaluate a UAF air filter can access UAF’s complimentary, round-the-clock prototype service available worldwide via www.uaf.com. The prototype service provides design engineers with assistance in meeting critical design, testing and evaluation deadlines for air filter media used in power generation, military, medical, computer networkingand telecom applications. To receive a prototype, the engineer can submit a request on the Internet or via telephone, fax or e-mail. Once the prototype is submitted, it is produced and shipped within five working days.
Universal Air Filter’s non-conductive filter frames meet the following standards and classifications: UL 94 HF-1; ATCA; UL 900; CE; Telcordia; NEBS GR-78-CORE and GR-63-CORE; micro TCA; ETSI; and are RoHS Compliant.
For more information, contact: Universal Air Filter Co., 1624 Sauget Industrial Parkway, Sauget, IL 62206. Phone: 800-541-3478. Fax: 618-271-8808. Web site: www.uaf.com.
Editor’s Note: This and other UAF news releases and high-resolution photos may be downloaded at www.uaf.com/press.
Framed Filters +/-.06″ length & width, +/-.03″ thickness
Pad Filters +/-.12″ length & width, +/-.06″ thickness
High efficiency pleated media is available from Universal Air Filter Company in MERV 11, MERV 13, and MERV 15 efficiency ratings. Visit our High Efficiency Filters product page for more details.
Universal makes also washable pre-filters for HEPA and cleanroom systems. Filters are designed to extend the life of the more expensive, throw-away HEPA filters.
Filter maintenance intervals are application specific and depend on the type of equipment they are used in and the environmental conditions the equipment is subjected to. Some equipment design engineers add messages to the controlling software of their device displays to indicate when filters should be serviced based on hours of operation. Others include pressure and / or temperature sensors downstream of the filter to detect when the filter is fully loaded and needs attention. It is accepted throughout the industry for electronics equipment designers to recommend cleaning or replacing air filters approximately every 90 days.
Since air filter foam can be subjected to a variety of environments beyond our control, Universal does not publish a life expectancy. “Shelf life” is not typically used to describe longevity because it is a relative term.
The ideal storage condition for polyurethane foam is a cool, dry, dark environment. Conditions that adversely affect the media are high temperature, humidity, and ultraviolet light. Foam media also degrades when exposed to solvents and sulfates, such as engine exhaust. Reduced foam life depends upon the degree of difference from the ideal conditions the foam is stored.
Customer feedback indicates that controlling relative humidity between 40%-80% and temperature between 40F-90F yields an acceptable environment. Covering the filters with dark plastic will keep media dry and protected from ultraviolet light.
We do not recommend storing foam filters for several months or years at a time. Instead, purchase cost-effective quantities and keep adequate inventory for no more than a few months.
Thermal analysis software is available for thermal / mechanical designers to simulate and predict cooling requirements. The thermal software packages, configured with component thermal libraries, enable users to predict pressure drop through air filter elements quickly and accurately. Universal Air Filter has provided filtration performance data to thermal analysis software suppliers, including Flotherm, Icepak, Macroflow and Coolit, so that filter thermal libraries could be incorporated in their software. Thermal libraries can now be used early in the design process to enhance the accuracy of the thermal analysis.
The trend towards smaller chassis and higher wattage has increased the demand for more data. Thermal modeling software packages are capable of factoring in the effect an air filter has on system pressure drop. Upon request, Universal can provide filter pressure drop and filtration performance data.
Air filter initial resistance and dust loading data can be a valuable resource in determining air filter performance and reliability. It can be to the OEM designer’s advantage to specify Universal air filters to satisfy a broad range of electronics and industrial applications.
Distribution of laminar airflow is critical. Laminar airflow insures that each card receives the same amount of air at the proper velocity. Otherwise, components may fail prematurely due to heat build-up. Designers previously had to use expensive perforated metal or aluminum honeycomb to get the air in the right place. Universal Air Filter Company can readily eliminate the need for a separate, expensive air-straightener.
Air straightening decreases the vortices and input power, increases downstream velocity, and maintains velocity over greater distances. This prevents large vortices from forming and distributes the pressure drop more uniformly across the chassis. The air filter media itself plays a major role in keeping airflow laminar.
Because Dual EMI Honeycomb air filters are removable, the air filter and shield are easily cleaned and reinstalled in the device as required. Dual EMI Honeycomb air filters meet the stringent filtration performance and flammability requirements of CE and UL. They deliver more than 60dB attenuation over a frequency range of 10 kHz to 1 GHz. A gasket installed around the frame assures conductivity of the frame to the enclosure, and the honeycomb structure reflects and absorbs EMI.
We also help designers meet the stringent requirements of UL 60950 (formerly UL 1950), ETSI, and EN 60950 for Europe. By specifying Universal, OEM designers can be assured that the air filter has been independently laboratory tested in accordance with MIL-STD-285 for EMI shielding and ASHRAE 52.1-1992 for particulate arrestance.
Four easy ways to clean Universal’s Windowpane, Quadrafoam™ and Uni-Foam Air Filters:
All Universal Air Filter products — Quadrafoam™, Unifoam, Polyester, Windowpane,Flexframe, and Dual EMI — are RoHS Compliant with the EU Directives for banned substances. Whether a framed air filter assembly, or media only pad, all air filter products are RoHS Compliant. Framed filter assemblies containing special metal finishes are treated with a RoHS Compliant chemical conversion coating. All Telcordia NEBS, UL 94 HF-1 flame resistant media for telecom and datacom applications are RoHS Compliant. Medical air filters, military communications air filters, and power-gen air filters are also RoHS Compliant. Click here to view our RoHS compliance document.
R4-18  All fan-cooled equipment shall be equipped with filters. Fan filters shall be replaceable with equipment operating. Rectifiers, distribution bays, and sealed equipment with only outside fan cooling do not require filters.
R4-19  All equipment fan filters used in equipment occupying over 2U of vertical rack space (90 mm or 3.5 in) shall have either a:
|Minimum dust arrestance of 80%, per ASHRAE Standard 52.1-1992,Gravimetric and Dust-Spot Procedures for Testing Air Cleaning Devices Used in General Ventilation for Removing Particulate Matter, or|
|Minimum Efficiency Rating Value (MERV) of 4, per ANSI/ASHRAE Standard 52.2-2007, Method of Testing General Ventilation Air Cleaning Devices for Removal Efficiency by Particle Size|
R4-20  All equipment fan filters used in equipment occupying 2U of vertical rack space (90 mm or 3.5 in) or less shall have either a:
|Minimum dust arrestance of 65%, per ASHRAE Standard 52.1-1992, or|
|Minimum Efficiency Rating Value (MERV) of 2, per ANSI/ASHRAE Standard 52.2-2207,|
R4-21 Fan filters shall meet the minimum fire rating of Underwriters Laboratories, UL 900-2004, Standard for Air Filter Units, plus revisions, and be marked “UL Classified”..
NOTE: Polymer filter media must also meet the fire-resistance requirements per Section 188.8.131.52, “Material/Components Fire-Resistance Criteria.
R4-22  Construction and system fit of equipment fan filters shall prevent any air bypass. Inadvertent leakage that may result from mechanical fits or tolerances, (examples may include spaces between circuit pack face plates, connector or cable matrices, chassis screw or mounting holes, etc.), is not considered bypass.
R4-23 Equipment shall have provision for fan-filter replacement with particulate contaminants from the filter being introduced into equipment. If filters can be changed with fans operating, filter replacement methods that minimize touching the media and/or dislodging captured particulates shall be specified. Filter designs with rigid frames that are withdrawn from the airflow for removal satisfy the intent of this requirement.
R4-24  The equipment manufacturer shall provide a method for determining equipment fan filter replacement schedules.
O4-25  If possible, active alarming should be provided to indicate the need for fan filter replacement.
R4-26  Equipment fan filters shall be single use and not the types the require cleaning.
O4-27  It is an objective that equipment fan filters utilize recyclable materials.
R4-61  Foamed polymers shall meet the HF-1 requirements of ANSI/UL 94-1996.
NOTE: Foamed polymer air filter assemblies must also meet the fire-spread requirements of GR-63-CORE, Section 184.108.40.206, “Equipment Fan-Filter Criteria.”
R8-3  All fan-cooled equipment shall be configured with filters.
R8-4  All equipment fan filters shall have a minimum dust arrestance of 80%. This represents a low efficiency 10 to 15% American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) dust spot rating.
R8-5  Fan filters shall have a minimum fire rating of Underwriters Laboratories (UL) Class 2.