Air filters play a vital role in modern life and are widely used in air conditioning, ventilation systems, air purification equipment and industrial production. They can effectively remove dust, pollen, bacteria, viruses, smoke, odor and harmful gases in the air to ensure the air quality of the environment. Choosing the suitable air filter specifications, models and sizes is essential to ensure the normal operation and filtering effect of the equipment. This article will explore the specifications, models and sizes of air filters in depth to help readers make more appropriate choices.

1. Specifications of air filters

Air filter specifications usually refer to their functional characteristics and applicable standards, mainly including filtration efficiency, air volume, filtration materials, and other aspects.

1. Filtration efficiency

Filtration efficiency is one of the core indicators of air filter performance, usually expressed as a percentage, which refers to the ability of the filter to remove certain particles or pollutants in the air. Different types of filters have different filtration efficiencies:

Primary filter: This is usually used to remove larger particulate matter, such as dust, sand, etc., and the filtration efficiency is generally between 30% and 50%.

Medium-efficiency filter: This filter is used to filter medium-sized particles, such as dust, pollen, etc., with a filtration efficiency of 60%- 80%.

High-Efficiency Particulate Air (HEPA) Filter: Known for its exceptional filtration efficiency, it captures 99.97% or more of particles as small as 0.3 microns. HEPA filters are widely used in environments with stringent air quality demands, such as hospitals, laboratories, and cleanrooms.

Ultra-high efficiency filter (ULPA): more efficient than HEPA filter, can reach 99.999% particle filtration capacity, suitable for ultra-clean environments such as clean rooms.

2. Air volume

Air volume is one of the core elements of air filter performance. It characterizes the volume of air that the filter can handle per unit time. It is usually measured in cubic meters per hour (m³/h) or cubic feet per minute (CFM). Appropriate air volume is essential to ensure air circulation and filtration efficiency. However, excessive air volume will increase energy consumption, while too small air volume may affect the filtration effect.

When selecting a filter, you should select a matching filter model based on the air volume parameters required by the equipment to avoid performance problems caused by inconsistent air volume.

3. Filter material and structure

The filter material of the air filter determines its filtering effect. Common filter materials are:

Glass fiber: has excellent filtering effect, especially suitable for HEPA and ULPA filters.

Synthetic fiber: commonly used in primary and medium efficiency filters, with low resistance and good filtering performance.

Activated carbon: mainly used to remove odors, harmful gases and volatile organic compounds (VOCs) in the air.

Metal mesh: usually used in coarse efficiency filters to capture larger particles.

2. Air filter model

The model of the air filter usually consists of multiple numbers and letters, indicating its specifications, type, material and performance. Knowing the model can help users quickly identify the characteristics of the filter. Common air filter models include:

1. Standard model naming rules

F5 to F9 These grades identify the effectiveness of the filter, where increasing values represent improved filtering efficiency. These grades are often used to distinguish primary, medium and high-level filters. High-efficiency particulate air (HEPA) filters are known for their wide application in high-demand environments, with a filtration capacity of more than 99.97%. Ultra-high efficiency particulate air (ULPA) filters are suitable for extremely clean environments and can achieve at least 99.999% filtration effect. MERV is the minimum efficiency reporting value standard established by the United States. The higher the value, the smaller the particle size of the filter can be intercepted.

2. Models and application areas

Medium efficiency and high efficiency filters, marked as G4, G5, G6, and G7, are widely deployed in industry, buildings, and air conditioning systems to optimize air quality. HEPA 13 and HEPA 14 grade high efficiency air filters are designed for places with extremely high air quality requirements such as hospitals, pharmaceutical factories, and clean rooms. Activated carbon filters effectively purify odors and harmful gases in the air and are commonly found in air purifiers and commercial kitchen ventilation systems.

3. Air filter size

Choosing the right air filter size is a key factor in ensuring filtration effect and normal operation of the equipment. The size of the air filter usually includes length, width, and thickness. Common size standards include:

1-inch thickness series: suitable for conventional air filters in air conditioning and ventilation systems, with sizes such as:

16 x 20 x 1 inch

20 x 20 x 1 inch

24 x 24 x 1 inch

2-4 inch thickness series: suitable for equipment that requires a larger filter area, usually used in industrial equipment and high-efficiency air conditioning systems, with sizes such as:

16 x 25 x 2 inches

20 x 25 x 4 inches

24 x 24 x 4 inches

Large size filters: suitable for large air conditioning systems and industrial applications, with sizes such as:

30 x 30 x 2 inches

36 x 36 x 2 inches

4. Summary

The selection of air filters is crucial for the adaptation of equipment and environment. Understanding its specifications, models and sizes, as well as key parameters such as filtration efficiency, air volume, and filter materials, users can make wise decisions based on actual needs to ensure that the selected filter is highly compatible with the application scenario. The right choice not only optimizes air quality, but also significantly improves equipment operating efficiency and extends its service life. In homes, commercial offices or industrial environments, precisely matched air filters are the cornerstone for achieving fresh air and stable equipment operation.