Cooker hood filters: how often to change them and what they really cost

A cooker hood has two filters and they behave in opposite ways. The grease filter is washable and lasts as long as the hood. The odour filter, the activated carbon one that is only needed in recirculation mode, gets thrown away and bought again. We at PortosEunostos went to read what the manufacturer actually declares and what the spare parts cost in the catalogue, and the result is less obvious than it sounds. Whoever sells you the hood is not required to tell you how long the filter you will have to buy again lasts, and over ten years that spare can cost more than the hood it sits in.

Two filters, two different rules

The grease filter is the metal mesh you can see under the hood: it traps the grease carried by the steam and every hood has one, in any mode. The activated carbon odour filter is only needed if the hood works in recirculation, that is if it puts the air back into the kitchen instead of pushing it outside. If you have a duct going outdoors, the second filter is not your problem.

The difference that matters is financial. You wash the first one, you buy the second. And the EU product information sheet, the one behind the energy label letters, declares the grease filtering efficiency (on the Bosch DBB97AM60 we analysed it is 90.2%, class B) but has not a single line about the odour filter. The recurring cost does not appear on the label.

The grease filter is washable and costs nothing

Here the figure is simple and verifiable: the Bosch user manual says «we recommend cleaning the grease filter every 2 months». There are two ways to do it, by hand in hot water and detergent with a brush, or in the dishwasher at a maximum setting of 70 °C. The manual warns about two things that prevent damage: do not wedge it between the dishes, because it deforms, and do not worry if it changes colour slightly, because that is normal and does not affect performance.

One note of honesty: the commercial data sheet for the same model promises that the filter «only needs to be cleaned once a month», therefore more often than the manual says. It is the same inconsistency between sheet and manual that we had already found when we analysed that hood. When in doubt the manual wins, because it is the technical document.

The odour filter is a subscription, and nobody writes the interval

This is where it gets interesting. We looked for the replacement interval of the activated carbon filter in four Bosch documents and we found four answers.

Three indications that are compatible with each other but a factor of two apart, and the document you should actually have at home, the manual, gives none at all. Worse: the data sheets of the cheaper filters and of the long life ones declare no service life whatsoever. The only code with a figure written down is the Clean Air Plus, and that figure is a minimum, not an expiry date.

What a filter costs: 75 spares compared

On 1 November 2026 we read the whole cooker hood accessories category on OpportunityCommerce: 525 items, 75 of which are genuine replacement odour filters (we excluded installation kits, air deflectors and chimneys). This is the picture.

Now let us put the two numbers together. Replacing one filter a year, the median price means 147.62 euros a year and 1,476 euros over ten years: more than the median hood, and more than the price of three quarters of the models on sale. If you follow the two replacements a year scenario you reach 295 euros a year. And one detail shows the scale of the mismatch: a replacement filter at the median price costs more than the cheapest hood in the catalogue, a 60 cm Faber at 100.34 euros. 15.2% of the hoods on sale cost less than 300 euros, that is less than two spare filters.

Regenerable or disposable: the price will not tell you

Regenerable, or long life, filters go back into the oven and become usable again instead of ending up in the bin. You would expect them to cost more. Across the 75 spares we read, they do not: the 31 declared regenerable or long life have a median of 139.00 euros, the 44 ordinary ones 149.96. Practically the same price.

This is the most useful piece of information in the whole article, because it overturns the instinct: if your hood accepts both versions, the regenerable one is not the premium option, it is simply the one you do not buy again every year. Watch out for the real constraint, though, which is not the price: the filter has to be compatible with your model, and compatibility is declared on the filter data sheet, not measured by eye.

The saturation indicator has to be set by hand

This step is written in the manuals and you will almost never find it explained. Bosch hoods with a saturation indicator have two distinct recirculation modes in the electronics, one for non regenerable filters and one for regenerable ones, and they are set with a key combination while the appliance is switched off. If you fit the recirculation kit and never touch that setting, the indicator counts according to the wrong schedule.

In plain terms: the indicator does not measure saturation, it estimates an interval based on how the machine is configured. It is a reminder, not a sensor. Those two lines of the manual are worth reading on the day you install the filter.

PortosEunostos tips

What to check before buying. If the hood is going to work in recirculation, ask for the exact code of the compatible odour filter and its price before you choose the hood: it is a cost that comes back every year and never appears on the label. Check whether a regenerable version of the same filter exists, because at the same outlay it saves you the later purchases. If instead you can run the duct outdoors, the problem does not exist and all you are left with is the metal mesh to wash.

How to judge the seller. For spare parts what counts is that the code is written out in full in the listing, because a similar filter is not a compatible filter. Look at the declared availability, since the gap between in stock and fifteen working days matters a lot when the hood is already saturated, and check the return conditions in case the code does not match. Spare part prices move: we have seen them change from one day to the next, so compare them at the moment of purchase and not from memory.

The Portos choice

Maintaining a cooker hood comes down to two lines: the metal mesh every two months, in the dishwasher at no more than 70 °C, and the activated carbon filter once a year if the hood works in recirculation. The second is the only one that costs money, and it costs enough to change the maths of the hood itself. We at PortosEunostos suggest deciding this up front: if you choose recirculation, budget for it and look straight away for the regenerable version, because in the catalogue it costs the same as the disposable one. You can see the real codes and prices in the cooker hood accessories category on OpportunityCommerce and compare offers on SniffaPrezzi, where there were thirty offers at the time of our check.

Also worth reading: how to choose a cooker hood, our analysis of the Bosch DBB97AM60 and, staying on cleaning, how to clean an induction hob without ruining it.

Sources

• Bosch, cooker hood instructions for use and installation, documents 9001530051_F and 9001160173_B (grease filter interval, 70 °C dishwasher setting, saturation indicator, two recirculation modes).

• Bosch, accessory data sheets DWZ1IX1B6 (Clean Air Plus service life of at least 12 months) and DWZ1DX1B4 (no service life declared).

• Bosch, carbon filter replacement and ducted or recirculating hood; manufacturer site bosch-home.com.

• Commission Delegated Regulation (EU) 65/2014 on the energy labelling of domestic ovens and range hoods.

• OpportunityCommerce catalogue, cooker hood accessories category and hoods category, prices recorded on 1 November 2026.