Definitions - doe-std-3020-20050006

DOE-STD-3020-2005

3. DEFINITIONS

Air Density: Air density equals 0.075 lb/ft3 (1.201 kg/m3) for standard air. This corresponds

to air at a pressure of 29.92 inches Hg (760 mm Hg) at a temperature of 69.8F (21C) with

a specific volume of 13.33 ft3/lb (0.832 m3/kg)

Airflow (ACFM): Airflow expressed in terms of actual cubic feet of air per minute (ACFM).

ACFM is a cubic foot of air at actual existing conditions.

Airflow Resistance: The resistance to airflow at the manufacturer rated airflow of the clean

filter when tested in accordance with ASME AG-1, FC-5000.

Approved Test Aerosol: Particle-generating materials approved by DOE for penetration

testing. Test aerosols approved by the DOE for tests conducted in the Filter Test Facility are

di-octyl phthalate (DOP), also known as DEHP and di-octyl sebacate (DOS), also known as

DEHS. Others may be approved after DOE evaluation.

Effective Filter Media Area: The effective surface area of the filter media in the assembled

filter element (without adhesive areas) through which the air stream is passed.

Filter Media Face Velocity: The rated airflow divided by the effective filter media area.

Filter Test Facility (FTF): A facility contracted by DOE specifically to conduct performance

quality assurance inspections and tests of HEPA filters.

FTF Quality Assurance Test: Inspection and testing of a HEPA filter at the FTF to verify

certain characteristics or properties which ensure the appropriate level of quality assurance in

the design, integrity and performance of HEPA filters.

High Efficiency Particulate Air (HEPA) Filter: A throwaway, extended-media, dry type

filter with a rigid casing enclosing the full depth of the pleats. The filter shall exhibit a minimum

efficiency of 99.97% at a test aerosol diameter of 0.3 micrometer.

HEPA Filter Types:

Open Face Filters : A filter with no restrictions over the ends or faces of the unit, as

opposed to the enclosed filter with reduced-size end connections.

Radial Flow Filters : A filter constructed from a continuous length of glass fiber filter

paper folded back and forth into pleats in a rigid annulus, with airflow in essentially a