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Indoor & Office Chemical Hazards (IOHA 2018 OnDemand)

Recorded at IOHA 2018

Earn 1 Contact Hour

3D printing (additive manufacturing) is a manufacturing technique where a physical object is created layer by layer using computer models. Small scale 3D printers are being used in libraries, academies, and office-like environments. Also, many SMEs are developing their businesses utilizing 3D techniques. A common thing among these workplaces is limited knowledge and poor consideration of worker health and safety issues regarding 3D printing. In this case study, our goal was to assess the risks of 3D printing and create guidelines for safe working practices. According to the results, employees may be exposed to dust, nanoparticles, gaseous compounds, and various chemicals during printing, cleaning, and maintenance of the 3D printers. Based on our findings, guidance documents for workplaces and occupational health care were created.

The use of computer simulations is a powerful tool in Indoor Air Quality (IAQ) studies. Multi-zone modeling is one of the most popular computing methods for IAQ because it can provide information on indoor airflow, temperature, and contaminant concentration distributions. The study presented was conducted in a research house using CONTAM (an indoor modeling program) software developed by US National Institute of Standards and Technology (NIST). The model was developed and calibrated to predict the contaminant distribution in the research house with the intention of having a tool for future research at the University of Texas at Tyler. To validate the results, statistical tools such as correlation coefficient, normalized mean square error, and others were used to evaluate the accuracy of IAQ prediction. Results show the ability of the model to predict satisfactorily gas contaminant distributions in the experimental house.

The Health Hazard Evaluation Program at NIOSH assessed exposures to lead and copper during a weapons qualifications course at an indoor firing range. The airborne lead and copper concentrations for instructors and officers participating in the course were evaluated and found to be below occupational exposure limits. Lead and copper was found on all surfaces tested. Instructors' skin and footwear had lead on them as they left work to go home. All instructors had detectable blood lead levels. The ventilation system was not operating within NIOSH recommended parameters. Range hygiene practices surrounding debris cleanup and hand washing could lead to increased exposure. The practical recommendations that resulted from this project can help reduce exposures to lead and copper for instructors and shooters at indoor firing ranges.

Stock #: IOHA_Sess5
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