Vaillant replacement filter set F9/G4 for recoVAIR 150/4 (polluted environment)

Product detailed description

Vaillant replacement F9/G4 filter set for recoVAIR 150/4 (for polluted environments)

The F9/G4 replacement filter set (manufacturer's part number 0020180872) is genuine accessory for the Vaillant recoVAIR VAR 150/4 heat recovery unit, designed as a more demanding alternative to the standard G4/F7 set for installations in polluted environments. The set includes a G4 class prefilter (captures coarser impurities - dust, fibres, insects, larger pollen particles) and a significantly finer F9 class filter, which is able to capture even very fine particles including PM2.5 and PM1 smog particles, industrial dust, mould spores and some bacteria. This combination represents the highest level of filtration commonly available for the VAR 150/4 unit within the genuine Vaillant accessory range.

While the standard G4/F7 set is fully sufficient for a typical, less burdened environment, the F9/G4 set is intended primarily for households in urban environments, near busy roads, industrial zones, or for residents with increased sensitivity to allergens and fine dust particles. The higher F9 filtration class captures a significantly greater proportion of the finest particles than the F7 class, providing a noticeably higher level of protection for the quality of air supplied into living spaces.

Technical characteristics

• Device type: replacement filter set (2 pcs) for the recoVAIR unit, higher filtration class
• Manufacturer's order number: 0020180872
• Set contents: 1× G4 class filter (prefilter, coarse impurities) + 1× F9 class filter (very fine filter, PM2.5/PM1, smog, mould spores, bacteria)
• Intended for: exclusively for the recoVAIR VAR 150/4 unit
• Recommended environment of use: urban, industrially burdened or allergen-demanding locations, or households with increased sensitivity to fine dust particles
• Recommended replacement interval: generally once a year, in case of higher environmental load a shorter interval may be possible according to the unit's service signalling
• Position in the air duct route: at the inlet of supplied outdoor air and at the inlet of extracted indoor air into the unit
• Standard alternative: G4/F7 filter set (code 0020180808) for a typical, less burdened environment
• Material: higher-density non-woven filter fabric in a frame adapted to the dimensions of the VAR 150/4 unit
• Country of origin: Germany / EU (Vaillant Group)
• Warranty: 2 years

Why choose the higher F9 filtration class

F9 class filters are among the finest commonly available filters for controlled ventilation systems in residential buildings, with an efficiency of capturing fine PM2.5 and PM1 particles significantly exceeding the F7 class. It is precisely particles of this size category - for example fine dust from combustion engines, industrial processes or solid fuel heating in the surrounding area - that are among the most health-hazardous components of polluted air, as they are small enough to penetrate deep into the respiratory tract.

In locations with a higher level of air pollution (cities, industrial zones, proximity to busy roads), the F9/G4 set therefore provides a noticeably higher level of protection for the quality of air supplied into living spaces compared to the standard G4/F7 set. Likewise, for households with allergy sufferers for whom the standard F7 pollen filtration level is not sufficient, the F9/G4 set represents a more suitable choice.

Installation and filter replacement

Replacing the F9/G4 filters in the VAR 150/4 unit is done the same way as with the standard G4/F7 set - the filter inserts are accessible after opening the unit's service cover. Due to the denser filtration structure of the F9 filter, we recommend handling it carefully to avoid mechanical damage to the fine filter layer, which could reduce its declared efficiency. For ceiling-mounted VAR 150/4 units, typical especially for apartments, we recommend checking the accessibility of the inspection space around the unit's service cover before replacing the filters.

Compatibility

This F9/G4 filter set is designed dimensionally and functionally exclusively for the recoVAIR VAR 150/4 model. For the medium and large VAR 260/4 and VAR 360/4 models, we offer a separate F9/G4 filter set with larger dimensions (code 0020180873, shared for both these models). The filters cannot be interchanged between models, as they differ in dimensions corresponding to the size of the air duct route of the specific unit.

Comparison of the F9/G4 set with the standard G4/F7 set

The price difference between the two sets is minimal for the VAR 150/4 model, so in case of any doubt about the quality of the surrounding air (for example proximity to a busy road, industrial facility or seasonal allergies among household residents), we recommend choosing the more demanding F9/G4 set - the additional cost is low, while the benefit for air quality can be significant.

What are PM2.5 and PM1 particles and why do they matter

The designations PM2.5 and PM1 refer to solid pollutant particles with a diameter smaller than 2.5 or 1 micrometre respectively - substantially smaller than the thickness of a human hair (approximately 50-70 micrometres). These fine particles are produced primarily by combustion processes (transport, industry, solid fuel heating) and are small enough that, when inhaled, they penetrate deep into the pulmonary alveoli and can partially enter the bloodstream. This is why these finest fractions of dust are considered one of the most hazardous components of polluted outdoor air in terms of long-term impact on the respiratory and cardiovascular systems.

The F9 class filter is designed to capture precisely this finest fraction of particles with high efficiency, unlike lower classes (G4, F7), which focus more on coarser and medium-fine particles. In locations with an increased concentration of PM2.5 and PM1 in outdoor air (typically large cities, industrial regions, areas with a high share of solid fuel heating in winter), the F9 filter therefore provides the highest degree of real protection for the quality of air supplied indoors.

When it makes sense to invest in a higher filtration class

We recommend basing the decision between the standard G4/F7 set and the more demanding F9/G4 set on several practical questions: Is your house or apartment located near a busy road, motorway or industrial zone? Does any household member suffer from asthma, pollen allergy or another respiratory sensitivity? Does your region experience increased smog during winter caused by local solid fuel heating? If the answer to any of these questions is yes, the F9/G4 set represents a justified investment in higher indoor air quality. On the other hand, when living in the countryside, further away from pollution sources and without health limitations, the standard G4/F7 set may be sufficient.

Relation to other household filtration

The F9 filter in the recoVAIR VAR 150/4 unit addresses filtration of air supplied by the central controlled ventilation system, which is a fundamentally different (and generally more effective) solution than standalone portable air purifiers placed in individual rooms. Since the recoVAIR unit filters all supplied air before it even enters the house, it provides a uniform level of filtration in all living rooms connected to the system, unlike local purifiers, whose effect is limited only to the room in which they are placed.

Recommendations for allergy sufferers and sensitive households

For households with children, elderly people or people with chronic respiratory issues, we recommend considering the F9/G4 set as a preventive measure even if the current location is not among heavily polluted ones - sensitive population groups benefit from a higher level of air filtration even under a milder pollution load. Combined with regular adherence to the recommended filter replacement interval and possibly supplemented with a VAZ CO/1 CO2 sensor for automatic ventilation performance control, this creates a comprehensive solution for maximum comfort and a healthy indoor environment.

When it is time to replace the filters

The manufacturer recommends an indicative replacement interval of approximately once a year; however, in case of higher environmental load (for example during the smog season in winter months in cities heating with solid fuel), it may be advisable to shorten the interval, as the finer F9 filters clog faster than lower-class filters under high concentrations of fine particles. We recommend following the unit's service interval signalling, or that of the VAZ S4/1 controller, rather than a purely visual assessment of clogging.

Maintenance and care

When handling used F9 filters, we recommend using gloves, as captured fine particles could be released back into the air if handled carelessly. Old filters can be disposed of as ordinary household waste. With each replacement, we also recommend checking the condition of the filter frame seal, to prevent unfiltered air from bypassing the filter insert, which would significantly reduce the benefit of the higher filtration class.

Why choose this particular filter set

This filter set is a genuine accessory directly from the manufacturer of the recoVAIR VAR 150/4 unit, made precisely to fit the dimensions of the unit's filter compartment. Compared to non-genuine or universal third-party filters, it guarantees a correct fit into the frame without gaps, maintains the declared F9 filtration class, and preserves the warranty conditions for the entire controlled ventilation system.

Frequently asked questions

Is the difference between the F9/G4 and G4/F7 sets significant?

Yes, the F9 filter captures a significantly greater proportion of the finest particles (PM2.5, PM1) than the F7 filter, which is especially noticeable in polluted urban or industrial environments.

Which recoVAIR model is this set intended for?

Exclusively for the VAR 150/4 model. For the VAR 260/4 and VAR 360/4 models, a separate, dimensionally different F9/G4 filter set is available.

Is this set worthwhile even in a typical rural environment?

Given the minimal price difference compared to the standard G4/F7 set, this set is a safe choice even in a less burdened environment, although its main benefit is most apparent in urban or industrially burdened surroundings.

How often do the F9/G4 filters need to be replaced?

Approximately once a year; in case of higher environmental load (e.g. smog season), a shorter interval may be advisable - follow the unit's service interval signalling.

Is handling the F9 filter more demanding than a standard filter?

We recommend using gloves during replacement and handling the filter carefully so that captured fine particles are not released back into the air; otherwise the replacement procedure is the same as with the standard set.

What is the warranty on this filter set?

We provide a standard 2-year warranty, the same as for other accessories and parts for Vaillant recoVAIR units.

Can I combine the F9 filter with a CO2 sensor or preheating?

Yes, filtration is an independent functional area of the system and can be freely combined with any other accessory for the VAR 150/4 unit.

Does the F9 filter also capture mould spores and bacteria?

Yes, thanks to its higher density and fineness of the filter layer, the F9 filter captures, in addition to fine dust, a substantial portion of airborne mould spores and bacteria, which is another reason it is recommended for more sensitive households.

Does the F9 filter reduce the unit's air performance?

The finer filtration puts somewhat higher resistance on airflow than the standard F7 filter, however, with a properly sized and regularly maintained system, this difference is only minimal for the VAR 150/4 unit and should not be noticeably perceptible in normal operation.

Seasonal recommendations for urban households

In urban environments, especially in regions with a high share of solid fuel heating (wood, coal), air quality typically deteriorates significantly during winter months, when so-called winter smog forms with a high concentration of precisely the finest PM2.5 and PM1 particles. We recommend that households in such locations consider shortening the F9 filter replacement interval specifically for the period before and during the heating season, when the filter load is highest, and conversely can use a longer interval during summer months with a lower concentration of pollutants in outdoor air.

Note: we recommend consulting the exact recommended filter replacement interval for your specific location and level of air pollution with the installation company or a Vaillant service technician, or monitoring publicly available air quality data for your region.

Can I later switch from the standard G4/F7 set to the F9/G4 set?

Yes, the switch is possible at any time, as both sets are dimensionally designed for the same filter compartment of the VAR 150/4 unit - simply order the F9/G4 set instead of the standard set at your next replacement.

Is there a higher filtration class than F9 available for recoVAIR units?

Within the standard genuine Vaillant accessory range for the VAR 150/4 model, the F9 class represents the highest commonly available level of fine filtration - it is therefore the highest-quality solution directly from the unit's manufacturer for demanding environments.

Summary

The F9/G4 replacement filter set represents the highest commonly available level of filtration for the Vaillant recoVAIR VAR 150/4 unit, suitable especially for households in urban, industrially burdened environments or for residents sensitive to fine dust particles and allergens. As a genuine accessory directly from the manufacturer, it guarantees a precise dimensional fit, the declared F9 filtration efficiency, and preservation of the warranty conditions for the entire system. With a minimal price difference compared to the standard G4/F7 set, it represents a reasonable investment in higher household air quality.

Note: we recommend consulting the exact recommended filter replacement interval for your specific property and location with the installation company or a Vaillant service technician.