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Understanding Different Types of Air Filters for AC Units

Updated: Dec 5, 2023

When it comes to your AC unit, one essential component that often goes overlooked is the air filter. It plays a critical role in maintaining the indoor air quality and the overall performance of your AC.

In this blog, we'll dive into the world of air filters, helping you understand the various types and their importance in keeping your AC running efficiently.

The Basics of Air Filters

Before we explore the different types of air filters, let's understand their fundamental role. Air filters are designed to capture airborne particles such as dust, pollen, pet dander, and even some bacteria, preventing them from entering your AC system and being circulated throughout your home or office. This not only maintains cleaner air but also protects the AC's internal components.

Understanding Different Types of Air Filters for AC Units

Breathing Easy? Discover the secrets of air filters! In our latest blog, we demystify the world of air filters for your AC unit. From budget-friendly fibreglass to high-efficiency HEPA filters, find out which one suits your needs. Breathe cleaner, fresher air with the right filter.

Fiberglass Air Filters

Fibreglass filters are some of the most common and budget-friendly options. They are constructed with layered fibreglass fibres, which create a basic barrier against larger particles. While they provide minimal filtration, they are better than having no filter at all. For higher filtration efficiency, regular replacement is necessary.

Pleated Air Filters

Pleated air filters are a step up in terms of efficiency. They are made of folded, layered sheets of material, providing a larger surface area for trapping particles.

These filters are more effective at capturing smaller particles, including some allergens, making them a popular choice for maintaining better indoor air quality.

HEPA (High-Efficiency Particulate Air) Filters

HEPA filters are renowned for their exceptional filtration capabilities. They are capable of trapping up to 99.97% of particles as small as 0.3 microns.

This makes them highly effective at removing allergens, bacteria, and even some viruses from the air. HEPA filters are especially beneficial for those with respiratory conditions and allergies.

Electrostatic Air Filters

Electrostatic air filters use an electrostatic charge to attract and capture particles. They are effective at removing dust, pollen, and mold spores from the air. Some models are washable and reusable, offering a more environmentally friendly option.

UV-C Air Filters

UV-C filters incorporate ultraviolet (UV) light to neutralise microorganisms like bacteria, viruses, and mould.

While they may not physically capture particles, they are highly effective at disinfecting the air. These filters are often used in healthcare settings and spaces where air quality is of utmost importance.

Activated Carbon Air Filters

Activated carbon filters are excellent at removing odours, gases, and volatile organic compounds (VOCs) from the air. They are commonly used in environments where chemical fumes or unpleasant odours are a concern.

MERV Rating

The effectiveness of an air filter is often measured by its MERV (Minimum Efficiency Reporting Value) rating. The higher the MERV rating, the more efficient the filter is at trapping particles. It's important to choose a filter with the appropriate MERV rating for your specific needs.


In conclusion, understanding the different types of air filters for AC units is essential for maintaining clean indoor air and ensuring your AC system's longevity. The choice of air filter depends on your specific requirements, whether it's improved indoor air quality, energy efficiency, or protection against allergens.

Regular replacement and maintenance, offered by professional AC maintenance service, are crucial to keep your AC unit running at its best.

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