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In-depth survey report: control technology for agricultural environmental enclosures at Nelson Manufacturing Company, Inc., Yuba City, California.

Hall RM; Heitbrink W; McGlothlin J
Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, ECTB 223-11b, 1997 Jul; :1-19
An evaluation of an agricultural environmental enclosure was conducted at the Nelson Manufacturing Company (SIC-5083, SIC-3523), a maker of retrofit cabs for tractors, with the objectives of evaluating the effectiveness of the filter system, identifying aerosol size distribution inside and outside the enclosure, evaluating air infiltration into the cab by identifying potential leak sources, and evaluating the protection factor. The finding indicated that the cab was more than 99% efficient at removing aerosols larger than 3.0 micrometers in diameter and providing protection factors greater than 250 for particles larger than 3.0 micrometers. The cab provided a mean protection factor of 16 for aerosols smaller than 1.0 micrometer in diameter. The efficiency of the cab's filtration system decreased as the particle size decreased below 2 micrometers, indicating there may be some leakage of small particles into the cab. The cab remained under positive pressure during the study at an average of 0.3 inches of water. This positive pressure reduces the possibility of aerosols entering the cab other than around the filters in the ventilation system. There is also a chance that some of the small aerosols found inside the can may be entering by the blowers or generated from the operator movement inside the cab.
NIOSH-Author; NIOSH-Survey; Field-Study; Region-9; Control-technology; Air-quality; Agricultural-machinery; Pesticides; Agricultural-chemicals; Air-filters
Publication Date
Document Type
Field Studies; Control Technology
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
NIOSH Division
SIC Code
5083; 3523
Source Name
National Institute for Occupational Safety and Health
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division