AHU filter in HVAC Working, Specifications, and FAQ's
Air Handling Units (AHUs) are a vital component of Heating, Ventilation, and Air Conditioning (HVAC) systems, responsible for maintaining indoor air quality in buildings, hospitals, pharmaceuticals, semiconductors, food and beverage, and petrochemical industries
AHU filters are a critical part of these industries, as they help to remove pollutants and particulate matter from the air before it is circulated into the system.
In this article, we will discuss the working, specifications, and frequently asked questions about AHU filters in HVAC.
Working of AHU Filters in HVAC
The working of AHU filters in HVAC systems is the same as in standard AHUs.
The AHU filters work by capturing airborne particles such as dust, pollen, and other contaminants.
The HVAC system pulls in air from the outside, filters it through the AHU filter, and then distributes it throughout the system.
The filters are designed to remove particles of varying sizes and can be made from various materials, including fiberglass, polyester, and synthetic materials.
Specifications of AHU filters in HVAC
AHU filters used in HVAC systems come in a range of sizes and types, depending on the applications and level of air filtration required.
AHU filters can be made from various materials such as fiberglass, pleated paper, polyester, or other synthetic materials.
The type of filter used depends on the specific application and the level of filtration required.
AHU filters are classified based on their efficiency in removing airborne contaminants from the air.
Technical specification table for AHU filters with the difference between EN779, ISO16890 and Merv.
| Filter Type | EN779 Rating | ISO 16890 Rating | MERV Rating | Particle Size Efficiency |
| Pre-Filter | G1-G4 | – | 1-8 | >10μm |
| Pocket Filter | M5-F9 | ePM1-ePM2.5 | 8-16 | 50%-95% |
| Fine Filter | F7-F9 | ePM1-ePM2.5 | 11-16 | 80%-95% |
AHU filters come in various sizes and thicknesses, and the size of the filter needed will depend on the size of the AHU and the volume of air that needs to be filtered.
Pressure drop is a measure of the resistance that air encounters as it passes through the filter.
Dust holding capacity is the amount of dust that a filter can hold before it needs to be replaced. This capacity can vary based on the filter type, size, and efficiency.
Different types of Filters Used in HVAC's
| Filter Type | Pre Filter | Fine Filter | Pocket Filter |
| EN779 Rating | G4 | F7 | F9 |
| ISO 16890 Rating | ePM10 | ePM1 | ePM1 |
| MERV Rating | MERV 6 | MERV 13 | MERV 11 |
| Particle Size | >3μ | >1μ | >1μ |
| Airflow Capacity | 1000-2000 CFM | 1000-2000 CFM | 1000-2000 CFM |
| Frame Material | Galvanized Steel | Galvanized Steel | Galvanized Steel/Aluminium |
| Minimum Efficiency | 30% | 50% | 75% |
| Maximum Efficiency | 80% | 99.97% | 95% |
| Dust Holding Capacity | 150g/m2 | 200g/m2 | 300g/m2 |
| Filter Thickness | 25 mm | 50 mm | 100 mm |
| Filter Dimension | 610 x 610 mm | 610 x 610 mm | 610 x 610 mm |
Maintenance and Replacement of AHU Filters in HVAC Applications
Regular maintenance and replacement of AHU filters are crucial in ensuring optimal air filtration and the health and safety of building occupants.
It is recommended to replace AHU filters every 3 to 6 months for residential applications and more frequently for commercial and industrial applications.
It is also essential to inspect AHU filters regularly to ensure they are not clogged or damaged.
Frequently Asked Questions
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1. What is the importance of using AHU filters in HVAC systems?
Answer: AHU filters used in HVAC systems are critical in maintaining indoor air quality. They help remove airborne particles like soot, ash, dust, pollen, and aerosols that can cause health problems, such as allergies and respiratory issues.
AHU filters also help prolong the life of the HVAC system by preventing dirt and debris from building up inside the system. -
2. How often should I replace my AHU filter in HVAC?
Answer: The frequency of filter replacement will depend on various factors, such as the level of air pollution in the environment and the type of AHU filter used.
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3. Can I clean and reuse my AHU filter in the HVAC?
Answer: It is not recommended to clean and reuse AHU filters used in HVAC systems. Over time, filters become clogged with dirt and debris, reducing their effectiveness. Reusing a dirty filter can also lead to the buildup of bacteria and mold, which can be harmful to health.
Final Words
AHU filters are a crucial component of HVAC systems, responsible for maintaining indoor air quality and the efficient operation of the system.
When choosing an AHU filter for an HVAC system, it is essential to consider the level of air filtration required and choose the appropriate filter size and efficiency rating.
Regular filter replacement is also crucial in ensuring optimal air filtration and the health and safety of building occupants.
If you’re interested in upgrading your Systems air handling unit (AHU) filters to high-efficiency options. Then we Amrit Filtration Equipments help you.
With a range of filtration equipment and a commitment to quality, We can provide the AHU filters you need to improve indoor air quality, HVAC system performance, and compliance with air quality regulations.
Contact Us today to learn more about Our products and services.
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