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Document ID (ISN)62979
CIS number 94-1629
ISSN - Serial title 1047-322X - Applied Occupational and Environmental Hygiene
Year 1993
Convention or series no.
Author(s) Mickelsen R.L., Jacobs D.E., Jensen P.A., Middendorf P.J., O'Brien D.M., Fishbach T.J., Beasley A.A.
Title Auxiliary ventilation for the control of nitrous oxide in a dental clinic
Bibliographic information June 1993, Vol.8, No.6, p.564-570. Illus. 23 ref.
Abstract Four auxiliary (local) ventilation systems, one system using only scavenging and three different local exhaust systems in conjunction with scavenging, were evaluated in a dental clinic. Two of the three local exhaust systems were effective in lowering the dental assistant's breathing zone samples to below the US National Institute for Occupational Safety and Health (NIOSH) REL of 25 parts N2O per million parts (ppm) of air. Both systems consisted of a scavenging system and flexible duct connected to a fan. The dental hygienist's breathing zone samples were greater than the NIOSH REL for all the systems tested. Increasing the capture velocities and thus improving the control could be achieved by either increasing the air-flow rates or moving the hood closer to the patient's mouth. Because of unacceptable noise levels created by increased air-flow rates, locating the hood closer to the patient may be the most effective means to improve the exhaust systems.
Descriptors (primary) local exhaust; dental services; exhaust ventilation; nitrous oxide
Descriptors (secondary) description of equipment; personal sampling; evaluation of equipment; comparative study; inhalation anaesthetics; permissible levels; air sampling; noise
Document type D - Periodical articles
Country / State or ProvinceUSA
Subject(s) Heating, ventilation and climate
Broad subject area(s) Chemical safety
Browse category(ies) Ventilation
Health care services
Inorganic substances