Qualitative Evaluation of Chemical hoods Performance of Laboratories of the University of Medical Sciences
Muhandisī-i bihdāsht-i ḥirfah/ī
and Objective: A variety of chemical and biological materials are used in the scientific and research laboratories of the universities of medical sciences. Various people, including the laboratory staff, students, and faculty members, are exposed to these materials; accordingly, various respiratory and dermatological symptoms may occur in these people. Regarding this, the aim of the present study was to evaluate the chemical fume hoods used in the laboratories of the medical universities.
... universities. Materials and Methods: This study was conducted on 43 chemical hoods of the laboratories of the universities of medical sciences. The technical specifications of the hoods and their compliance with the standards were investigated. The amount of hood suction was measured through air flow visualization and hood face velocity using a thermal anemometer. The data were analyzed in SPSS software, version 19. Results: According to the results, 51.2% and 44.2% of the hoods had inappropriate conditions in terms of hardware and location, respectively. Maximum of face velocity was 96.16 ft/min. The results showed that 50.2% of the hoods had a visible leakage. The mean face velocities were not suitable in any of the hoods when they were 100% and 50% open. These velocities were appropriate only when the hoods were 25% open. Conclusion: Based on the findingss, the hardware and performance characteristics of most of the hoods were inappropriate. Furthermore, they had a low impact on the control of pollutants. Consequently, it is necessary to adapt to the changes and modifications of the hoods in accordance with the standards. An annual assessment of hood performance should also be applied in the hood maintenance program.