Penetration

DOE-STD-3020-97

shall be tested for penetration and resistance. The penetration at

each specified airflow and the resistance at nominal airflow rating

shall be marked clearly and indelibly on the case of the filter unit

tested. At the discretion of the FTF, the customer may be advised to

request the manufacturer to supply evidence of compliance with

qualifications tests and materials requirements of the specification.

Failure to meet inspection, test, or verification requirements shall be

cause for rejection of the filter(s). After the testing and inspection is

completed, each filter will bear a FTF test label indicating acceptance

or rejection.

Penetration. Each filter unit shall be tested for penetration by a

6.2.2

DOE-approved aerosol and test method at a DOE FTF as follows:

Size 1 and 2 (up to 125 cfm [212 m3/hr]) filter units: 100% of

rated airflow.

Size 3 (125 cfm [212 m3/hr]) and larger filter units: 100% and

20% of rated airflow.

Filters with penetration rates in excess of 0.03% (0.0003)

measured at a particle diameter of 0.3 micrometer shall be

rejected. When tested with a laser spectrometer test method, the

maximum penetration and the aerosol particle size of maximum

penetration shall be reported in addition to the penetration at 0.3

micrometers diameter. However, penetration at 0.3 micrometers

diameter shall be the only criterion used to judge whether a filter

is rejected for excess penetration.

Resistance. The air flow resistance across the HEPA filters shall

6.2.3

conform to the limits listed in Section 5.2, Table 1. Tests for

resistance to airflow shall be conducted at flow rates expressed in

actual cubic feet per minute (ACFM).