Air Filters G3-F9 for HVAC Ventilation in Georgia

What is an air filter used for?

The main task of an air filter is to capture particles present in the air before that air reaches the building or the HVAC equipment.

Filtration may be needed to reduce dust in the outdoor air, protect HVAC equipment, reduce contamination of a heat exchanger, reduce dust build up in ventilation ducts and improve indoor air quality. Not all filters have the same purpose - some mainly capture coarse particles, while others are used for higher efficiency filtration.

What types of air filter are available at NB Group?

The current NB Group range includes: HHK HEPA filter box with grille; HF13MRM1PG HEPA filter; MB7G25S08 bag filter; ES300 electrostatic filter; a HEPA filter for medical facilities; a pre filter; and a general air filter.

These products are used at different stages and for different cleanliness requirements, so a filter should not be selected by size alone.

What is a pre filter?

A pre filter is a component of the first filtration stage, whose task is to capture relatively large particles. Using it can help protect the higher efficiency filter placed at the next stage. A pre filter is often used so that coarse dust is captured, the main filter does not become contaminated quickly and the service life of the final filter is used better.

What is a bag filter?

A bag filter consists of several filtration pockets, which creates a relatively large filtration surface. Filters of this type are widely used in central ventilation and air handling systems. The NB Group category includes the MB7G25S08 bag filter. For a specific model the filtration class, size, nominal airflow and pressure loss must always be checked.

What is a HEPA filter?

A HEPA filter is used for high efficiency air filtration and is particularly important in spaces where high air cleanliness requirements apply. The NB Group HF13MRM1PG HEPA filter is described as an absolute air filtration product, with fields of use including clean room ventilation systems, microelectronics, the food industry, data centres, hospitals and the medical device industry.

When selecting a HEPA filter it is important to check the specific class and technical characteristics. The word "HEPA" alone is not enough to establish suitability for a specific project.

What is an electrostatic filter?

An electrostatic filter uses an electrostatic effect to capture particles. The NB Group range includes the ES300 electrostatic filter. Whether it can be used has to be assessed according to the specific ventilation system, particularly the airflow, the type of contaminant and the maintenance requirements.

What does filter class mean?

The filter class indicates its filtration capability, although the classification system can differ for different types of filter. "A higher class always means better" is therefore not the right approach. A higher efficiency filter can also create greater resistance in the system.

Why does pressure loss matter?

Air has to pass through the filter, and the filter creates a certain resistance to air movement. When a filter becomes contaminated, the resistance usually increases. This can lead to reduced airflow, changes in fan load, worse system performance and increased energy consumption. A filter should therefore not be assessed only by how well it captures particles.

Can the highest class filter be installed in any system?

Not always. If the existing system is not designed for a higher resistance filter, the real airflow can be reduced. The result can be insufficient ventilation, reduced airflow in the room and non optimal fan operation. Before moving to a higher class filter it is therefore necessary to assess the technical capability of the equipment and the fan.

How often should an air filter be replaced?

There is no single universal period for filter replacement. The frequency depends on outdoor air pollution, operating hours, filter type, system airflow, the purpose of the building and the manufacturer's instructions. For example, in a dusty industrial environment a filter can become contaminated much faster than in a relatively clean office building.

Why should the system not run without a filter?

Without a filter, dust present in the air can reach the fan, the heat exchanger, the heat recovery unit, the air conditioning coils and the duct network. Over time this leads to contamination of the equipment and increased maintenance needs. A filter is therefore a component not only of air quality, but also of HVAC equipment protection.

What are the most common mistakes when selecting an air filter?

Selecting by size only

A filter that fits physically may not be technically suitable.

Ignoring the filtration class

Different spaces have different cleanliness requirements.

Automatically choosing the highest efficiency filter

A high efficiency filter may create excessive resistance for the system.

Not replacing a contaminated filter in time

This affects the airflow and the operation of the system.

Air bypassing the filter at the edges

If the filter does not sit correctly in its frame, part of the air may not be filtered at all.

What information is needed to select an air filter?

Before selection it helps to know:

• where the filter will be used;
• what kind of building or space it is;
• what type of HVAC equipment it is installed in;
• what size of filter is required;
• how much air passes through the system;
• what filtration class is required;
• what pressure loss is permissible;
• whether a pre filter is needed;
• whether HEPA filtration is required;
• how the filter will be serviced.

With this data a filter can be selected according to real working requirements, not just size.

Air filters at NB Group

NB Group supplies air filters for ventilation and HVAC systems - from standard pre filtration to high efficiency and specialised solutions.

The current category includes a pre filter, a bag filter, HEPA filters, a HEPA filter box with grille, an electrostatic filter and filtration solutions intended for medical facilities. NB Group branches are located in Tbilisi and Batumi.