Purpose and Characteristics of High-Temperature Air Filters

June 28, 2023

Purpose of High-Temperature Air Filters

High-temperature air filters are primarily used to filter particles such as tar, coal smoke, and dust generated in high-temperature sterilization tunnels or drying rooms in pharmaceutical plants. They are classified into high-temperature resistant pre-filters and high-temperature resistant high-efficiency filters based on their efficiency levels.

Purpose and Characteristics of High-Temperature Air Filters

Characteristics of High-Temperature Filters

While filters are commonly used in our daily lives, regular filters cannot withstand the high temperatures in certain working environments, leading to damage. Therefore, high-temperature filters have been developed. High-temperature filters are widely used in high-temperature sterilization tunnels, drying rooms, laboratories, pharmaceutical factories, and other fields. The classification of high-temperature filters is based on their efficiency, and they can be divided into pre-filters and high-efficiency filters, omitting the intermediate-efficiency stage found in other filters. High-temperature filters use specially synthesized fibers or glass fibers to improve filtration efficiency and accuracy.

High-temperature filters are highly durable. When ultra-fine glass fibers are used as filter materials, the improved filtration effect and efficiency are evident. Other parts of the filter, such as the separators, are made of aluminum foil or cardboard, which protects the filter media to a certain extent and reduces the risk of use. The frame of the high-temperature filter is made of galvanized or other stainless steel materials, ensuring its normal operation and increasing its strength and filtration area to some extent.

The main feature of high-temperature filters is their ability to withstand high temperatures. They can operate continuously in environments up to 250 degrees Celsius without the leakage issues experienced by other filters. This is a significant advantage. High-temperature filters can be further divided into flat panel, HTR, and folded types.

Flat panel filters use glass fibers as materials, and the filter media is mainly laid flat within the filter. Both sides are covered with molybdenum metal protective screens and grid meshes, with a temperature resistance of 400-450 degrees Celsius.

Folded filters have good strength and are less prone to be blown open by strong winds. They can function normally in high-wind environments. The temperature resistance of folded high-temperature filters can reach 250-310 degrees Celsius.

These are the main characteristics of high-temperature filters. They have been briefly categorized, but there are some points to consider. When using high-temperature filters, attention should be paid to the presence of stains and dust in the environment. Excessive dust and stains require regular cleaning to avoid affecting the equipment's performance. The operation of high-temperature filters should be carried out by professional technicians to improve their efficiency. Like any mechanical equipment, regular cleaning and maintenance are necessary to avoid impacting the service life of high-temperature filters.

Types of High-Temperature Filters

[Flat Panel High-Temperature Filters]

Made from domestic or imported glass fibers, layered in a non-woven manner.

The fibers have good strength and elasticity, preventing compression of the filter media due to high air resistance and affecting dust holding capacity.

The filter media is laid flat within the filter, with both sides reinforced by 40-120 mesh metal protective screens and supported by large grid meshes.

Temperature resistance 400-450°C.

Filtration efficiency G4, F5.

Performance characteristics Excellent chemical resistance, strong heat resistance, low moisture absorption, high dust holding capacity, long service life, and non-combustibility.

[Folded High-Temperature Filters]

The filter media is folded using galvanized iron wire mesh or stainless steel mesh, providing good strength and resistance to bursting.

Both sides are reinforced with galvanized grid meshes, galvanized diamond meshes, or stainless steel grid meshes, allowing normal operation in high airflow environments.

Temperature resistance 250-300°C.

Filtration efficiency G3.

Performance characteristics Large filter media area, long service life, high airflow capacity, low initial resistance, and non-combustibility.

Application Areas

General primary filtration and high-temperature air filtration in hot air ovens.

High-temperature air filtration in painting factories.

Performance Characteristics of High-Temperature Filters

Available in various efficiency specifications from H10 to H14 to meet different requirements.

Stainless steel frame with special temperature-resistant sealing material, resistant to temperatures up to 250°C and 319°C.

Special folding equipment for folding.

Special glass fiber filter paper as filter media.

Special aluminum foil separators.

Each filter undergoes anti-volatility treatment and strict testing.


High-temperature filters are mainly used in equipment and systems requiring high-temperature air purification, such as clean ovens, clean cleaning machines, and the chemical industry.