Atrea Duplex EC5/ECV5 filters

We carry filter sets for the widely used Atrea Duplex series – the most popular residential and small commercial heat recovery units in Central and Eastern Europe. If you know your unit is labelled Duplex but aren't sure of the exact variant (e.g. Easy, Basic, RD5, RD6 control versions), the most accurate way to pick the right filter is to measure the existing filter's length, width and height and compare them with the dimensions listed in our catalogue.

Atrea's manufacturer recommendations for Duplex filters cover a few points:

• check the filters every 3 months
• replace them at least twice a year, even if they look clean
• watch for the maintenance reminder shown on the RD5/RD6 controller display, which is triggered once the pressure drop across the filter increases

Following this on-screen reminder rather than a fixed calendar date gives a more accurate result, matched to the actual air quality conditions in your space.

Most Atrea Duplex units accept both the standard G4/M5 class filter and the higher-grade F7/ePM1 (in some cases F7 ePM1 70) filter in the same housing, without any additional modifications. If you or a family member suffer from pollen or dust allergies, upgrading the supply air filter to F7 class is one of the simplest ways to improve air filtration at home without replacing the unit itself.

Some Atrea Duplex variants support an additional activated carbon filter layer on the supply side, which helps absorb vehicle exhaust fumes, cooking odours and other volatile organic compounds (VOCs) before they enter the living space. This filter is added alongside, not instead of, the standard G4/F7 filtration, so before ordering it's worth checking the depth of your unit's filter compartment to make sure the extra layer fits inside the housing.

If the filter you ordered doesn't match your Duplex variant, we accept returns or exchanges as long as the filter is unused and still in its original packaging. The simplest way to avoid this situation in the first place is to send us the exact Duplex model code, or the filter's own dimensions, before ordering – this way you avoid a mismatch and the unnecessary wait involved in a return.

For a seasonally used house, plan the filter change around the season rather than the calendar. Fit fresh filters when you open the house in spring, and check them again before closing it for winter – if the unit has been running on a low setting through a damp autumn, the filters may have absorbed moisture and are best replaced rather than left in over winter. If the unit is switched off for months, remove the old filters before the standstill and install new ones when you restart it, so the first air that reaches the rooms doesn't pass through a damp, dusty filter. Store spare Duplex filters in their packaging in a dry room, not in an unheated outbuilding.