What is 3 Stage filtration for an AHU and how does it work?

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A 3-stage filtration system for an Air Handling Unit (AHU) is a multi-layer filtration system that is designed to remove a wide range of contaminants from the air. The three stages of filtration are designed to remove different types of contaminants, with each stage providing a higher level of filtration.

The three stages of filtration are:

  1. Stage 1: Pre-filter: The pre-filter is typically the first stage of filtration and is designed to remove large particulate matter such as dust, dirt, and pet hair.
  2. Stage 2: Medium-Efficiency Filter: The medium-efficiency filter is the second stage of filtration and is designed to remove smaller particulate matter, such as mold spores and bacteria. This stage of filtration typically uses a synthetic fiber or electrostatically charged media.
  3. Stage 3: High-Efficiency Filter: The high-efficiency filter is the final stage of filtration and is designed to remove even smaller particulate matter, such as tobacco smoke, chemicals, and volatile organic compounds (VOCs). The final stage of filtration is designed to remove the smallest particles, such as bacteria, viruses, and smoke particles. This is typically done using a high-efficiency filter, such as an ULPA filter or a HEPA filter.

The air first passes through the pre-filter, which removes the largest particulate matter. The air then passes through the medium-efficiency filter, which removes smaller particulate matter. Finally, the air passes through the high-efficiency filter, which removes even smaller particulate matter.

By using a multi-stage filtration system, the AHU can provide a high level of indoor air quality, removing a wide range of contaminants from the air. The efficiency of each stage of filtration can be improved by using high-quality filters and regularly replacing them as needed.

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