Air and Gas filters

Air & gas filters – technical overview

Air and gas filtration covers a wide range of technologies, from coarse pre-filtration to high-efficiency and absolute (HEPA) filtration. In ventilation and industrial systems, filter selection is typically driven by the required air cleanliness, contaminant type (dust, aerosols, odours, grease, paint overspray) and system constraints such as pressure drop, energy use and available installation space.

Air filtration stages in a typical filter train

Most installations use multi-stage filtration to combine long service life with reliable air quality. Coarse stages protect downstream filters and equipment, while high-efficiency stages deliver the required cleanliness for people, processes and sensitive equipment.

• Coarse pre-filtration – protects HVAC components and improves lifetime of downstream filters (often ISO Coarse classes)
• Fine filtration – improves indoor air quality and reduces fine dust fractions (often ePM10 / ePM2.5 / ePM1 classes)
• High-efficiency filtration – used where higher purity and stable performance are required (e.g. M5–F9 / higher efficiency compact filters, depending on system design)
• Absolute filtration – final stage for the highest air purity requirements (EPA / HEPA / ULPA)

Filter types in this collection

Filter mats (rolls and cut formats)

Filter mats are versatile media used for protective pre-filtration, control cabinets, HVAC units and surface treatment applications. Depending on the mat type, they can be used as general dust filters or as paint stop media in spray booths. They are supplied in rolls or cut to size for flexible integration.

Fan coil panel filters

Fan coil panel filters are lightweight filters used in fan coil units to reduce dust and coarse contaminants. Their open design enables airflow across the full surface, helping protect heat exchangers and improve indoor comfort in offices, hotels and public buildings.

Cassette and pocket filters

Cassette filters are commonly used as first-stage or intermediate filtration in HVAC systems. Pocket filters (ISO 16890) provide high dust holding capacity and stable performance under higher dust loads, making them one of the most widely used solutions in commercial and industrial ventilation.

Minipleat cassette filters

Minipleat cassette filters increase filtration surface area within the same footprint compared to conventional pleated designs. This supports high dust holding capacity and low pressure drop, improving energy efficiency while delivering higher filtration performance (commonly M5–F9).

Compact filters

Compact filters are high-efficiency filters used where fine particle control is critical and installation space is limited. They are often applied as high-efficiency stages in ventilation systems and can be configured with construction options such as protective grids or mounting flanges.

HEPA HT (EPA / HEPA / ULPA)

HEPA HT filters are absolute air filters used where the highest air purity is required. They are typically installed as final stages in clean environments or critical industrial applications. Efficiency classes follow EN 1822-1, covering EPA, HEPA and ULPA ranges.

Application-specific filtration

Paint overspray filtration

For spray booths and paint walls, filtration focuses on capturing overspray efficiently and maintaining stable airflow. Common solutions include Andreae cardboard paint stop filters and paint stop filter mats, often used as first and second stages depending on the booth design and required capture efficiency.

Odour and VOC removal

Activated carbon filters remove odours, gases and volatile organic compounds (VOCs) using adsorption. They are often applied in comfort ventilation (restaurants, hotels, offices) and in industrial environments with chemical vapours. Carbon stages are frequently combined with particulate filtration for best results.

Grease filtration for exhaust air

Grease cassette filters are metal mesh filters used in commercial kitchens and food processing exhaust systems. They protect ducts and fans from grease accumulation, support hygiene and help reduce fire risk. These filters are designed for easy washing and reuse.

Industrial dust collection (cartridge filters)

Cartridge filters are used in industrial dust collectors for welding, powder coating, grinding and similar processes. Their pleated cylindrical construction provides large filtration area in a compact volume and supports pulse-jet cleaning to extend service life and maintain stable operation.

Key selection criteria

• Contaminant type – dust, fine dust fractions, paint overspray, grease aerosols, odours/VOCs, fumes
• Required efficiency – ISO Coarse / ePM classes / higher efficiency stages / EPA-HEPA-ULPA
• Pressure drop and energy use – lower resistance improves fan efficiency and operating cost
• Dust holding capacity – affects service life and maintenance intervals
• Construction and fit – frame type, sealing concept, mechanical protection and housing compatibility
• Custom dimensions – made-to-order sizes for retrofit and bespoke installations

All filters in this range can be supplied in custom dimensions and configurations to match the application requirements and installation constraints.