Manufacturer and supplier - Air filters for recuperators, heat pumps and mechanical ventilation systems.

They are no different from the original ones when they are made in accordance with current standards. Just like the original filters, they must meet the filter performance requirements set by a number of different standards. Filters may differ in workmanship by design, but the filtration parameters for the level of filtration may even be higher when using a filter made in a higher class. In addition, many manufacturers of air handling units order their filters from filter manufacturers. Thus, many times it can happen that the replacement filter differs only in the label.

The dimensions of sealed filters are given separately for the frame and gasket. Namely, the dimension of the frame plus the thickness of the gasket with a pitch of 1-2 [mm].

Check the nameplate for the make and model of your appliance, or measure the filters in your appliance and compare with the dimensions shown in the product description. Determine what filtration class of filters you need for yourself and your family. The letter denotes the filter group and the number refers to the efficiency thus the G4 filter retains much less pollution than the F7 filter. It is worth noting at this point that fine filters of group F retain particles harmful to Our health. Therefore, we also recommend using them on the supply and on the exhaust we suggest using the medium class M or coarse class G . Regarding the filter area, the larger the filter, the longer the filter operation and less frequent the replacement. Filter area is the amount of material placed in the filter frame. Surfaces of different types of filters, assuming the same dimension, from the smallest to the largest: flat, pleated, plot, minipleat.

Filters need to be replaced when they are fully soiled or once every 6 months. Dirty filters are dark you can see insects and dust and other impurities on them. Commission Regulation (EU) No. 1253/2014 requires manufacturers to install devices in air handling units that indicate when the filter needs to be changed. Indicators include a timer and a pressure device:

The timer is usually set for a specific period of time, such as 90 days. You can check if the filter is dirty and then set the timer according to your actual needs.

Pressure indicators measure the pressure drop on the filter. Therefore, it is necessary to change the filter when the dirt indicator turns on.

Note that failure to replace filters on time may lead to the voiding of the air handling unit manufacturer’s warranty. In addition, dirty filters result in higher energy bills.

No, air filters have an arrow on the rating label indicating the direction of air flow through the filter. Thus, the filter should be installed according to its indication or description on the label. Reverse installation results in increased air resistance and faster filter wear.

When creating your own set of filters for your recuperator, it is worth considering their purpose. Are they only to protect the ventilation system, or also to take care of air quality and our health?

If we care only about protecting the system, G4 or M5 filters on the intake/supply and exhaust/exhaust are sufficient. On the other hand, if the priority is cleaner air free of fine pollutants, it is worth using more precise F7, F9 or F7 filters with activated carbon on the intake / supply. On the exhaust/exhaust remain G4 or M5, because the air here is removed from the building and does not require advanced filtration.

Note that fine filters have higher air resistance and wear out faster, so their use is recommended on the intake / supply.

Grease filters and polyurethane mats can be safely cleaned with water and detergent. Their design allows washing, and regular cleaning is even recommended. After washing, the filter should be rinsed thoroughly and allowed to dry completely before reuse.

In the case of coarse and fine filters, such as G4, M5, F7 or F9, any attempt at cleaning – vacuuming, blowing or washing – leads to damage to the structure of the filter material. These filters act like a sieve, thickening toward the outlet side, which means that they retain finer and finer contaminants deep into their structure. Mechanical cleaning can result:

• Blowouts, or localized damage to the strands, through which air will pass without filtration.
• Tearing of the fibers, which reduces the efficiency of particle capture and shortens the life of the filter.
• Clumping of the filter material, especially after washing, which leads to reduced airflow and can promote microbial growth.

Consequently, a damaged coarse filter can generate more air resistance, and a fine filter will lose its cleaning ability, letting contaminated air through. Therefore, instead of trying to regenerate, it is recommended to regularly replace the filters with new ones.

The choice of filter frame for a recuperator depends on the operating conditions. Cardboard frames are lightweight and environmentally friendly and work well in home systems, but are sensitive to high humidity. Metal ones, made of steel or aluminum, are durable and resistant to harsh conditions, so they are often used in industry. Plastic ones, most often made of ABS or PP, are lightweight, resistant to moisture and work well where there is increased humidity. For the home, a cardboard one will usually suffice, while in more demanding conditions it is better to choose a metal or plastic one.