Filter Test Facility (FTF)

DOE-STD-3025-99

3.4

Geometric Standard Deviation ( g)

3 ni (In di -In dg)2

‡

N-1

3.5

Di-Octyl Phthalate (DOP)

Also known as di-ethylhexyl phthalate or DEHP. For purposes of this standard, an

aerosol of di-octyl phthalate droplets in clean filtered air.

3.6

Di-Octyl Sebacate (DOS)

Also known as di-ethylhexyl sebacate or DEHS. For purposes of this standard an aerosol

of di-octyl sebacate droplets in clean filtered air1.

3.7

Filter Test Facility (FTF)

A facility accepted by the DOE specifically to conduct quality assurance inspections and

tests of HEPA filters.

3.8

High Efficiency Particulate Air (HEPA) Filter

A throwaway, extended-media, dry type filter with a rigid casing enclosing the full

depths of the pleats. Aerosol collection efficiency of the filter shall be at least 99.97%

for 0.3 micrometer diameter particles. The maximum airflow resistance shall be as

specified in Section 5.2.2, Table 1 of DOE-STD-3020-97.

3.9

High-Flow Alternative Test System

A method of testing HEPA filters rated at greater than 250 cubic feet per minute (cfm)

that consists of a laser aerosol spectrometer, a microcomputer, an aerosol diluter and a

Laskin nozzle system to generate test aerosol. Penetration is determined at discrete

aerosol particle sizes in the range where maximum penetration occurs.

Dennis, Richard, editor, "Handbook on Aerosols," US DOE/ERDA TID 26608, p. 111, 1976.