Engineering Horizons



February 27
16:28 2015

By: Azim Ashraf, CEO, Remca Lahore. The author of this article is a Founding Member of Pakistan HVACR Society and past SVP and past Chairman of Lahore Chapter and Member of ASHRAE. He was awarded Lifetime Achievement Award in 2009. He is a CEO of REMCA, a consulting firm in HVAC&R field. E-mail


Unfortunately, while planning & constructing a hospital of any type, neither Infection Control Risk Assessment (ICRA) & Infection Control Risk Mitigation Recommendations (ICRMR) are prepared by the owners / management, nor are incorporated in contract documents by the Design professionals, resulting in that no serious attention is paid for the maintenance of Indoor Air Quality which is the basic & foremost important requirement of any hospital. Health Departments of all provinces & of Central government are suggested to pay their attention and all hospitals, (government, semi government or private), must get the indoor air quality (bacteria / virus control) checked by Third Party once a year and then their licenses should be renewed.

Pakistan HVACR Society can help Ministry of Health & the concerned authorities at Federal, province & private levels to introduce such measures progressively over a period of 3 years, to make the environment of hospitals free from polluted / contaminated air, which are attributed a great risk under the charter of healthcare facilities.

 The design of HVAC Systems for hospitals, outpatient clinics and other health care facilities is a specialized field of engineering. The high filtration requirements and pressure relationships between adjacent spaces are a few of the many design issues that are especially critical to the proper design and functioning of an HVAC System in a healthcare facility. Healthcare facilities have special design criteria. Knowledge of, and insight into these criteria are needed to develop a design that should satisfy the owner, and the operators of the facility. Knowledge of regulatory requirements will minimize the compliance problems.

Healthcare facilities are environments of controlled hazards. Exposure to aerosolized pharmaceuticals, airborne contagions, and strong cleaning chemicals are examples of these hazards. Building related illness, especially associated with airborne infectious agents, continues to be a challenge for healthcare organizations that treat infectious patients and those extremely susceptible to environmental microbes such as Legionella and Aspergillus. Good design will help delineate best practices to optimize the safety of occupants.  A fundamental premise of this article is that well designed HVAC System augments the other facets of the built environments to offer a “healing environment”; minimizes the airborne transmission of viruses, bacteria, fungal spores and other bio- aerosols, and minimizes the impact of building and its processes on the environment. This premise, if followed, will help to establish a safe environment in modern healthcare facilities. Continual advances in medicine and technology necessitate constant re-evaluation of the HVAC needs of hospitals & medical facilities. Medical evidence has shown that proper air conditioning is helpful in preventing and treating many conditions. Normally, healthcare facilities are divided into the following categories:-

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Engineering Horizons

Engineering Horizons

“Engineering Horizons” is the first & leading technical magazine of Pakistan covering Process, Mechanical, Metallurgical, Mining, Electrical & Electronics field under a single cover. We also feel pleasure in saying that this is the only magazine of its own kind & style, which is widely circulated in all Engineering Sectors of Pakistan.

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