Fractional aerosol filtration efficiency of air cleaners. Report for January 1991-December 1992

Technical Report · Fri Jan 01 04:00:00 EST 1993

OSTI ID:6012205

Hanley, J T; Smith, D D; Ensor, D S; Sparks, L E

The paper gives results of an evaluation of the fractional filtration efficiency of air cleaners. The test duct accepts air cleaners up to 610 x 610 mm in size and provides test flow rates up to 470 L/s. Filtration efficiency is computed from upstream and downstream aerosol concentration measurements performed with a differential mobility analyzer, a laser aerosol spectrometer, and a white-light optical particle counter. The measurements cover the particle diameter size range from 0.0l to 3 micrometer in 16 sizing channels. Air cleaners tested include furnace filters, pleated filters, and statically charged panel filters. The efficiency of the air cleaners was often found to be highly dependent on particle size and dust load. A minimum in efficiency was frequently observed in the 0.1 to 0.5 micrometer range. The presence of a dust load on the air cleaners frequently increased their efficiency. However, for some air cleaners, little change or a decrease in efficiency accompanied the dust loading. The common furnace filter was seen to have a fractional efficiency of less than 10% over much of the 0.01 to 1 micrometer size range.

• Research Organization: Research Triangle Inst., Durham, NC (United States)
• OSTI ID: 6012205
• Report Number(s): PB-93-236636/XAB
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320107* -- Energy Conservation
Consumption
& Utilization-- Building Systems-- (1987-)
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AEROSOLS
AIR CLEANING SYSTEMS
AIR POLLUTION
AIR POLLUTION CONTROL
BUILDINGS
COLLOIDS
CONTROL
DISPERSIONS
ENGINEERED SAFETY SYSTEMS
ENGINEERING
ENVIRONMENTAL ENGINEERING
FILTERS
FILTRATION
FURNACES
INDOOR AIR POLLUTION
MEASURING INSTRUMENTS
MOBILITY
OFFICE BUILDINGS
OPTICAL SYSTEMS
PARTICLE SIZE
POLLUTION
POLLUTION CONTROL
RESIDENTIAL BUILDINGS
SEPARATION PROCESSES
SIZE
SIZING
SOLS
SPECTROMETERS