Topic 3 - Extra Reading.pdf - A Simple Guide to Health Risk Assessment Office Environment Series OE 4/2004 Occupational Safety and Health Branch Labour

Topic 3 - Extra Reading.pdf - A Simple Guide to Health Risk...

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Office Environment Series OE 4/2004 A Simple Guide to Health Risk Assess ment Occupational Safety and Health Branch Labour Department
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Contents Introduction 1 Ventilation of a building 1 Purposes of ventilation 2 Risk assessment 2 Problems and solutions 5 Appendix 1 14 Appendix 2 14 Appendix 3 15 Appendix 4 16 Air conditioning system 17 Third Edition November 2004
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1 Ve n t i l a t i o n Introduction This guide is intended to help employers and employees assess the health risks associated with ventilation systems in their workplace. Such assessments can be no more than an examination of what, in the course of work, could possibly cause harm to people. With the help of this guide, you may identify hazards, the degree of risk and the possible solutions. Ventilation of a Building Ventilation is the process of supplying and removing air by natural or mechanical means to and from a building. The design of a building’s ventilation system should meet the minimum requirements of the Building (Ventilating Systems) Regulations. “Natural ventilation” covers uncontrolled inward air leakage through cracks, windows, doorways and vents (infiltration) as well as air leaving a room (exfiltration) through the same routes. Natural ventilation is strongly affected by weather conditions and is often unreliable. Mechanical or forced ventilation is provided by air movers or fans in the wall, roof or air-conditioning system of a building. It promotes the supply or exhaust air flow in a controllable manner. Natural Ventilation Mechanical Ventilation
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2 Ve n t i l a t i o n An air-conditioning system Purposes of Ventilation Ventilation in a building serves to provide fresh and clean air, to maintain a thermally comfortable work environment, and to remove or dilute airborne contaminants in order to prevent their accumulation in the air. Air-conditioning is a common type of ventilation system in modern office buildings. It draws in outside air and after filtration, heating or cooling and humidification, circulates it throughout the building. A small portion of the return air is expelled to the outside environment to control the level of indoor air contaminants. The efficiency of a ventilation system can be evaluated through investigation of environmental factors such as the quality of supply air, the thermal comfort conditions of the occupied space and the level of airborne contaminants therein. Risk Assessment The following checklist is designed to help you examine the environmental factors and assess the health risks in your workplace. Answer all the questions and if your answer(s) is the same as that indicating “potential hazards”, there are deficiencies in the safety management system or the ventilation is inadequate . You are advised to go through the guidance materials presented in the following sections and apply suitable solutions to eliminate or reduce the health hazards. Should you get matched answers in question marked with , health risks are imminent and immediate remedial actions are required.
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