1. NEBS GR-63 Issue 5 December 2017 Updates
January 22, 2018

2. NEBS GR-63 Issue 5 – December 2017
Air Filter Fire-Resistance Criteria
R4-57 Foamed polymer air filter media must be rated UL 94 HF-1 (was R4-61)
Air Filter Criteria
R4-18 Fan cooled equipment should be equipped with an air filter (was R4-18)
O U high equipment should be equipped with an air filter
An air filter digressing from R4-21 criterion is preferred over no filter at all in 1U high chassis

3. NEBS GR-63 Issue 5 – December 2017

4. NEBS GR-63 Issue 5 – December 2017
Air Filter Criteria (continued)
R4-20 ≥ 3U high equipment must meet minimum 80% arrestance (was R4-19)
R4-21 ≤ 2U high equipment must meet minimum 65% arrestance (was R4-20)
R4-22 Air filters must be marked UL Classified (was R4-21)
R4-24 Air filters must be designed to contain a rigid frame (was R4-23)
R4-25 Equipment manufacturer must provide air filter replacement schedule (was R4-24)
R4-27 Air filters must be designed to be single use (was R4-26)

5. NEBS GR-63 Issue 5 – December 2017