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In-depth survey report: control technology for environmental enclosures: an evaluation of in-use enclosures at San Joaquin Helicopter Company, Delano, California, report no. CT-223-16a.

Authors
Heitbrink-WA; Moyer-E
Source
NIOSH 2000 Jun; :1-32
NIOSHTIC No.
20000930
Abstract
Tractors equipped with environmental enclosures can be used to protect worker from pesticide spray mist and other particulate air contaminants. In these cabs, a fan pulls air through filters and then blows this cleaned air into a cab, pressurizing the cab. These enclosures may be used instead of respirators to protect the workers from pesticide spray mist. Because such enclosures may be in use for many years, enclosure performance may degrade due to aging and inadequate maintenance. To evaluate the extent to which this occurs, 3- to 4-year-old enclosures retrofitted to tractors were evaluated at San Joaquin Helicopter Company. A single 3- to 4-year-old enclosure was evaluated. Optical particle counters were used to measure the aerosol concentration inside and outside of the cab. The ratio of these concentrations is termed penetration, the fraction of the aerosol which penetrates into the enclosure. For particles in the 0.3 to 0.4 micrometer range, penetration into the cab was reduced from 0.11 to 0.004 by eliminating leakage around the filter.
Keywords
Control-technology; Pesticides; Pesticide-residues; Ventilation; Ventilation-systems; Region-9
Publication Date
20000601
Document Type
Field Studies; Control Technology
Fiscal Year
2000
NTIS Accession No.
PB2001-101671
NTIS Price
A01
Identifying No.
CT-223-16a
NIOSH Division
DART
Priority Area
Control-technology
Source Name
National Institute for Occupational Safety and Health
State
OH; CA
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