They are widely used in medical cleanrooms for research, testing, and the development of treatments using sensitive substances. Low pressure cleanrooms, or negative pressure rooms, are ideal for applications that need to isolate substances, particles, or fumes inside the cleanroom environment to protect the space outside. negative PRESSURE CLEANROOM APPLICATIONS: Medical cleanrooms also use positive pressure to protect sensitive patients and maintain a controlled space.Įven when the stakes aren’t as high, using slightly positive pressure in cleanrooms can help reach cleanroom classifications and maintain an overall cleaner environment. Semiconductor cleanrooms, microprocessor cleanrooms, and aerospace and defense cleanrooms are examples of industries that benefit from positive pressure cleanrooms, as they are highly averse to contaminating particles. High pressure, or positive pressure rooms are beneficial in applications where the slightest particle interference could disrupt processes within the cleanroom. Positive PRESSURE CLEANROOM APPLICATIONS: The monitoring system will check and maintain consistent pressure, which can be adjusted manually or automatically. If you implement a pressurization system into your cleanroom design, a pressure monitoring system is vital to ensure balance and consistency. To maintain positive or negative pressure in cleanrooms, adjacent spaces must be maintained at a lower or higher pressure than that of the cleanroom. The resulting negative pressure means the air will want to flow into the cleanroom to fill the low pressure area, effectively stopping contaminants from going against that natural movement to escape the cleanroom. To achieve negative air pressure, external exhausts pull air from the cleanroom at a faster rate than air is introduced over a span of time. ![]() Because the cleanroom has positive pressure, the air is forced out of the cleanroom, preventing contaminated or unfiltered air from seeping in. This positive pressure ensures that the products and processes within the cleanroom are protected in the event of a breach or leak. ![]() If a door or window were opened in the cleanroom, air would rush out into the outside environment. In a positive pressure cleanroom, filtered air is consistently pumped into the room through the HEPA filtration and cleanroom HVAC system. Using pressure in cleanrooms, either high pressure (positive pressure) or low pressure (negative pressure), can benefit many cleanroom applications, but how do you implement it in the cleanroom design ?Ĭleanroom pressure is achieved by controlling how much air is put into the cleanroom and how much is withdrawn. Using Positive and Negative Pressure in Cleanroom Design Conversely, lower pressure air within a cleanroom can trap contaminants and prevent them from leaving a cleanroom, as the natural flow of air wants to move in. Higher pressure air within a cleanroom (compared to the air outside the room) blocks contaminants from entering the cleanroom, as air naturally wants to flow out. This concept can be applied to cleanrooms to stop airflow into a cleanroom or out of it, limiting particle transfer via the air and maintaining a cleaner environment. When air is moving out of the balloon, air isn’t also moving into the balloon, as long as the air inside the balloon is more pressurized. What happens in all of these situations is that when air is moving in one direction, it’s not moving in the opposite direction. The air travels from a high pressure environment to the relatively low pressure of the surrounding air. Have you ever witnessed the sudden closing of a door as air is sucked out of a room even though there’s no breeze? This experience is high pressure air moving to a low pressure area to achieve stasis.Īnother example of this process is when air escapes from a balloon. For example, wind and weather are formed from the uneven heating of the earth’s surface, which generates pockets of high and low pressure air. Examples of this are found around us every day. How Does Air Pressure in Cleanrooms Work?Īir naturally flows from areas of high pressure to areas of low pressure. positive pressure cleanrooms, and discover how they work. Let’s dive deeper, learn the difference between negative pressure vs. High and low, or positive and negative, pressure can be used as tools in cleanroom environments to help cleanrooms reach their required classifications. The level of pressure determines the way air naturally moves in a space. Two main types of cleanrooms are negative pressure rooms and positive pressure rooms. In today’s fast-paced world of technology, pressurized cleanrooms are being utilized in more and more industries and applications.
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