Farhad Forouharmajd - Department of Occupational Health Engineering, School of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran
Shiva Soury - Department of Occupational Health Engineering. School of Health, Ilam University of Medical Sciences, Ilam, Iran
Mehran Mokhtari - Department of aerospace engineering, Amirkabir University of Technology, Tehran, Iran
Zahra Mohammadii - Department of Occupational Health and Safety, School of Public Health and safety, Shahid Beheshti University of Medical Science, Tehran, Iran

Background and purpose: Vibration caused by ventilation systems in buildings is one of the harmful physical factors that can cause harm to residents. Therefore, measuring and controlling vibration is important. Materials and Methods:  In the first step of the study, the vibration accelerometer was placed on the base of a fan where the vibrations were sent toward the duct wall. A vibration assessment of the building was conducted in the other steps to compare with guidelines. In the next step, the isolation method was used to control vibration. By placing the isolator on the duct wall, the accelerometer was located on the body of the duct wall and the value of vibration was measured in a millimeter per second. All stages of the experiment were performed in the Faculty of Health of Isfahan University of Medical Sciences in ۲۰۱۸. Results: The maximum vibration velocity reduction in the building was related to the frequency of ۶۸ Hz, which reached ۳۳ mm/s after isolation. In addition, the fan vibration at ۴۸۵ Hz was equal to ۲.۱ m /s, which decreased to ۲ mm /s after isolation. Conclusions: Comparison of vibration after fan isolation with standard showed that this method has been effective in reducing the fan vibration resulting in the vibration to reach below the standard.

Human Vibration, Building, HVAC Equipment