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.
NIOSH 2000 Jun; :1-32
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.
Control-technology; Pesticides; Pesticide-residues; Ventilation; Ventilation-systems; Region-9
Field Studies; Control Technology
NTIS Accession No.
National Institute for Occupational Safety and Health