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An operation theater room should be aseptic, highly sterile, and restricted. Proper ventilation with 20 air changes each hour, separate doors for entry and exit, and sliding doors to minimize air currents are some measures that can help prevent and control infection in operating theaters. The operating theater complex should be properly zoned based on the levels of cleanliness, the presence of microorganisms, and the types of procedures carried out. There should be separate areas for preparation and disposal, scrubbing and gowning, and for the storage, sterilization, assembly, and washing of materials and equipment.
In addition to these measures, fumigation is a method that can be used to sterilize an operating theater room. Formaldehyde gas (bactericidal, sporicidal, viricidal) is widely employed as it is cheaper for sterilization of huge areas like operation theaters.