How do I know which filter class (G4 or F7) to choose for my heat recovery unit?

G4 (Coarse) class filters trap large dust particles and insects and are mostly used for exhaust air, while F7 (ePM1) class filters trap fine particulate matter and pollen, making them ideal for the supply air stream. In most heat recovery units, you can use a set of two G4 filters if you live in a clean environment and want maximum airflow. However, during spring and summer, especially for allergy sufferers, it is highly recommended to use an F7 filter on the supply side to prevent pollen from entering your rooms.

Can heat recovery unit filters be washed and reused?

No, most modern heat recovery unit filters cannot be washed with water because moisture destroys the dense pleated structure of the material, causing the filter to lose its properties. When you wash a filter, the microscopic pores stick together, making it impermeable to air. Although a washed filter might look cleaner on the outside, it will heavily strain the unit's motors, increase electricity consumption, and potentially cause expensive breakdowns. A clogged filter must always be replaced with a new one.

What should I do if the unit displays a clogged filter error message?

First, turn off the unit, replace the old filters with new ones, and then reset the filter replacement timer on your control panel. The error message is usually based on a pre-set time interval (e.g., 90 or 180 days) rather than a physical sensor. Therefore, even after inserting new filters, the unit will continue to display the error until you confirm in the system settings that the replacement has been completed.

Heat Recovery Unit Filters

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Replace your clogged heat recovery unit filters and instantly bring pure air back into your home. Original and high-quality compatible filters effectively trap dust, spring pollen, and insects, while protecting your expensive heat exchanger from premature failure. Regular filter replacement guarantees quiet ventilation system operation and noticeably reduces electricity consumption.

Clogged filters – a direct path to poor air and high bills

Imagine your home's ventilation system trying to breathe through a thick, dirty blanket. When heat recovery unit filters fill up with dust, outdoor insects, and pollen, the airflow in your home drops drastically. Instead of enjoying freshness, your bedroom starts to feel stuffy, moisture lingers longer in the bathroom, and your windows fog up in the morning because heat recovery units simply cannot extract the stale air anymore.

Ignoring filter replacements hits both your wallet and the device's health. A clogged filter creates immense resistance, forcing the unit's motors to spin much faster and louder just to push the same volume of air. Because of this, you hear an annoying hum at night and receive an unreasonably high electricity bill at the end of the month. Worst of all, dust that manages to bypass an overflowing filter settles on the sensitive heat exchanger, permanently reducing its efficiency.

The feeling of fresh air and silent operation

Inserting new filters instantly fills your home with lightness and freshness. You will feel the difference after just one night – sleep becomes deeper because clean, oxygen-rich air circulates continuously through your rooms without any outdoor pollutants. During spring and summer, high-quality filters become a lifesaver for allergy sufferers, trapping pollen before it ever enters the living spaces.

A clean ventilation system operates so quietly that you will forget it even exists. The motors no longer have to fight air resistance, allowing the device to run in a balanced state and consume minimal energy. By changing your filters regularly, you not only protect your family's respiratory tracts but also extend the lifespan of the heat recovery unit itself and the entire ductwork system, avoiding expensive deep-cleaning procedures in the future.

Timely filter replacements can reduce ventilation system electricity consumption by up to 20% – a clean filter allows the motors to work without strain, saving you money every single day.

Selecting the appropriate filter is a critical step that determines the air quality in your home. The market offers a wide variety of models, but to achieve maximum results, it is important to pay attention to a few key technical parameters and the specifics of your living environment:

Filter class G4 (Coarse) - basic protection that traps large dust particles, hair, lint, and insects. These filters create the least air resistance, making them ideal for exhaust air (to protect the heat exchanger from house dust) or for supply air in very clean rural areas.
Filter class F7 (ePM1) - dense fabric filters designed to capture fine particulate matter, smog, car exhaust soot, and pollen. This is a mandatory choice for the supply air stream if you live in a city, suffer from allergies, or reside near unpaved dirt roads.
Dimensions and model compatibility - heat recovery unit filters are not universal. You must know the exact model of your device because even a mismatch of a few millimeters can lead to gaps, allowing unfiltered, dirty air to bypass the filter and enter the unit.
Filter frame type - filters come in metal, plastic, or cardboard frames. While cardboard frames are more eco-friendly, a plastic or metal frame will provide greater stability and durability in particularly humid environments.

Choosing filter classes according to the season

Many users practice a flexible filter replacement strategy depending on the season. In winter, when there is less dust outside, you can use G4 class filters on both sides of the unit to minimize electricity consumption. However, once spring blooming begins, it is highly recommended to insert an F7 filter on the supply side to reliably protect your home from allergens. Meanwhile, do not forget to keep your ceiling diffusers spotless using specialized cleaning supplies.

How to correctly replace a heat recovery unit filter?

Changing filters is a quick and straightforward procedure that requires no tools. It takes only a few minutes but demands attention to ensure dirt does not fall back into the device itself.

Safe shutdown - always completely disconnect the heat recovery unit from the power supply. Never change filters while the unit is running, as the motors can suck dust deep into the system.
Careful removal - open the filter compartment cover and pull out the clogged cartridges slowly, without shaking them. Immediately place them into a garbage bag so accumulated allergens do not spread through your home.
Correct insertion - when installing new filters, look closely at the airflow direction arrows printed on the frame. These arrows must point in the same direction that the air is moving through the unit (either towards the rooms or towards the outside).
Timer reset - after turning the unit back on, navigate to the filter replacement menu on your control panel and reset the timer. This ensures the system will remind you exactly when the next change is due.

The importance of regular maintenance

Do not leave filter changes to chance – make it part of your routine. It is recommended to check your filters every 3 months and replace them at least twice a year, depending on the pollution levels of your area. If you live in a new construction neighborhood with heavy dust, you might need to change your filters as often as every 2 months. The investment in new heat recovery unit filters is minimal compared to the immense comfort, health benefits, and device longevity they provide.

Heat Recovery Unit Filters

Often bought together with

Clogged filters – a direct path to poor air and high bills

The feeling of fresh air and silent operation

Choosing filter classes according to the season

How to correctly replace a heat recovery unit filter?

The importance of regular maintenance

Frequently Asked Questions

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Often bought together with

How clean heat recovery unit filters change your home's microclimate

How to choose the right filter for your ventilation unit?

Filter replacement and system maintenance

Frequently Asked Questions

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