Hi Brian:
I have only a passing familiarity with the type of requirements that you are asking about, but I can offer a few tidbits. For telecom carrier equipment, requirement GR-63-CORE (2012) requires a filter on all fan-cooled equipment, and contains requirements for the filtering ability of the filter, ease-of-replacement, and fire resistance. For the tests on filtering ability, GR-63-CORE references "ASHRAE 52.1 (1992)" and "ANSI/ASHRAE 52.2 (2007)." For the fire resistance tests, GR-63-CORE calls out UL 900 (2004). I do not have copies of the ASHRAE standards or UL 900, so I can't readily check to see what they say. I should mention that at engineering conferences for telecom equipment, the vendor display area usually has one or two vendors that specialize in GR-63-CORE compliant filter arrangements. I can't recall the vendor names I have seen, but a little google searching will likely turn them up. Joe Randolph Telecom Design Consultant Randolph Telecom, Inc. 781-721-2848 (USA) <mailto:j...@randolph-telecom.com> j...@randolph-telecom.com <http://www.randolph-telecom.com> http://www.randolph-telecom.com From: Kunde, Brian [mailto:brian_ku...@lecotc.com] Sent: Monday, September 19, 2016 12:43 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Risk Assessment of Air Filter I seek advice and opinions from fellow safety minded people. Our typical product has a metal chassis which is constructed as a Fire Enclosure (laboratory equipment 61010-1). On the back is a cutout for a cooling fan/blower mounted in the cutout. The fan is 24Vdc, certified by several safety agencies, and has a finger guard. This is typical configuration on most electronics. Now, our customers want us to install an externally changeable Air Filter on the outside surface of our instrument where the fan is mounted to filter dust particles from the incoming air. We already perform Blocked Vent and Stalled Fan tests to insure no hazards are caused from the rise in internal temperatures. But what type of Fault Testing or Risk assessment needs to be done regarding the filter? With the filter removed, the instrument passes the construction requirements for a Fire Enclosure. But with the filter installed and because of its close proximity to the fan/blower; 1. does this filter have to meet Flammability requirements? Does the filters have to be certified (expensive)? UL 94 HF-1?, UL 94 HF-2?, UL 900? How are these ratings/certifications viewed outside of North America? Will they have to meet local requirements?? 2. If the fan/blower is certified and limited energy circuit does the filter have to have any kind of rating or certification? In other words, with a certified fan/blower, do I have to consider the fault condition of the fan failing in a way where it could catch the filter on fire? 3. How is a fault and/or risk assessment performed on an air filter? 4. Are we responsible to consider the hazards from a burning filter when it is dirty? How would we know what type of contaminates might collect in a filter? 5. If the filter we provide is UL 94 HF-1 and UL 900 rated/certified, what would stop our customer from replacing it with whatever filter they wanted? Are we responsible to include a warning label and statements in the manual regarding this? Example, "Use only Air Filter part number XYZ". 6. Any other suggestions or issues that we are not considering? Thanks in advance. Have a nice day. The Other Brian _____ LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. 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