Historical
NSF/ANSI 49-2004a Addendum 2.0
[Historical Standard] Class II biosafety cabinetry - 2004a, addenda 1 & 2
This edition of the Standard, Addendum 2.0 to NSF/ANSI 49-04a, expands the definition of high efficiency filters (3.13) to include specifications for both high efficiency particulate air (HEPA) filters and ultra-low-penetrating air (ULPA) filters and revisions to rounding errors that affect the pass/fail criteria throughout the document. It also clarifies significant digits in metric and English system conversions. Revisions from Addendum 1.0 have been added to this document for the convenience of our customers.
CONTENT PROVIDER
NSF International [nsf]
NSF International [nsf]