NSF 49-04a Addendum 2.0

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This edition of the Standard, Addendum 2.0 to NSF/ANSI 49-04a, expands the definition of high efficiencyfilters (3.13) to include specifications for both high efficiency particulate air (HEPA) filters and ultra-lowpenetrating 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.

Product Details

Published:

03/01/2005

ANSI:

ANSI Approved

Number of Pages:

16

File Size:

1 file , 240 KB

Part of:

NSF 49-2004a