Qualities

AFPRO’ HEPA filters are characterised by their combination of innovative design and proven technology. HEPA stands for high efficiency particle air filter. The use of high quality materials enables these filters to provide an extremely high air quality. On completion of the assembly process, each individual filter is tested in accordance

with the EN1822 standard.

The HEPA filters’ construction and the materials used are subject to continuous further development, which yields increasingly lower resistance and therefore reduced energy consumption. The filter media are made of glass microfiber sheet. This vouches for consistent performance, while enabling use of the filters in highly critical environments, such as in hospitals and the nuclear industry.

Advantages of HEPA filters

•  Consistent performance

•  Large filter surface

•  Every single product is tested in compliance with EN1822

•  Robust construction helps prevent damage during transportation and fitting

•  Low energy consumption, thanks to smart pleating methods

•  Proven quality, even in critical environments

Construction

HEPA filters are constructed in various ways, depending on their application. AFPRO Filters endeavours to achieve the lowest possible resistance for each model, thus helping to reduce your energy costs. We supply the following types of HEPA filters:

Turbulent flow filters

This type of HEPA filter is widely used in circumstances where there are few requirements relating to the airflow’s laminarity,but high air quality standards are applicable. The filters have a high flow rate, thanks to the application of efficient deep-pleating methods. The construction methods applied vary for the following model types:

A Standard model

These filters have nominal capacities, which serve as the basis for system design. Application of the deep-pleating method makes for low resistance at relatively low cost. The filter surface may be up to fifty times larger than its front area.

B High capacity model

These HEPA filters have even lower resistance and higher flow rate.They operate on the basis of V-shaped filter packages, which are inserted in the filter. This method creates twice as large a filter area and flow rate in comparison to those of the standard model.

Laminar flow filters

HEPA filters with a laminar flow are widely applied in cleanrooms,where high air quality standards are essential. These have a lower flow rate than the turbulent flow filters. Laminar flow filters guarantee greater cleanliness in the cleanroom, thanks to aspects including the use of high quality filter paper and innovative pleating techniques.

HEPA filters are available as standard in 68. 80. 90 and 110 mm thicknesses, while the pleat package has a maximum height with a view to achieving low resistance.

Applications

HEPA filters are used in hospitals and various other sectors, including the nuclear, food processing and semiconductor industries. HEPA filters are highly reliable, as they are subjected to strict quality checks and extensive testing.

Installation

It is essential that the following rules be observed when installing HEPA filters:

•  Avoid touching the pleat package, as this may cause damage

•  Ensure that every HEPA filter is validated following installation,to ensure that it is    correctly fitted and devoid of damage

•  Keep copies of test reports on the filters, and maintain suitable records of the test    reports, stickers, resistances and validation reports

•  Ensure that the flow rate of HEPA filters is never exceeded by more than 25%. Such    excesses may cause performance deterioration or even damage the filter

•  When fitting, ensure that the frames and filters are clean and that gaskets and any other   seals are completely intact

•  Use suitable protective equipment at all times, even when replacing used filters

•  Maintain filter installation records; note the date, type and initial resistance.