Shopping Cart
- Luxtehnika toimetus
- Buying guides
- 0 likes
- 73 views
Short answer. A hob with a built-in extractor takes in steam and fumes at the cooking zone and passes them through a grease filter. The air then either leaves the house through a duct or passes a charcoal filter and returns to the kitchen. The unit takes up space inside the base cabinet, and each mode needs its own duct or vent opening, so plan those first.
1. How a hob extractor works compared with a hood
A hood sits above the hob and catches what rises. A hob extractor is built into the hob itself; Miele describes the KMDA 7473 as a “TwoInOne”. The air passes a grease filter and, in recirculation mode, a charcoal filter. Gaggenau lists free positioning of cookware, fully automatic ventilation and a low-noise fan among the features of its CV 282, and Miele offers its KMDA 7473 as exhaust air (FL-A) or recirculation (FL-U).
2. When it makes sense and when a hood is better
A hob extractor makes sense when
- the hob sits on an island or in an open-plan room and you do not want a hood above it;
- you can spare the space inside the base cabinet (section 4);
- you can route a duct, or provide the recirculation vent described below.
A hood may be the better choice when
- the cabinet under the hob must stay free for deep drawers;
- you cannot build a duct to the outside and would have to recirculate: the filtered air then returns to the kitchen, and the vent opening must stay clear;
- you cook in very tall pots: we found no manufacturer figure for this, so check your model’s manual.
Compare with a hood in our cooker hood buying guide, and browse downdraft hoods that sit in the worktop.
3. Ducted or recirculation
Some models come in both versions. Figures below are from the manufacturers’ data sheets for the Miele KMDA 7473 and the Gaggenau CV 282. Our range carries the later KMDA 7473-1, so confirm the details on the product page.
| Model | Ducted (exhaust air) | Recirculation |
|---|---|---|
| Miele KMDA 7473 | FL-A: DMK 150-1 with a 150 mm round connection, or DFK flat-duct parts | FL-U: Plug&Play adapter and DKF 35-P charcoal filter supplied |
| Gaggenau CV 282 (CV282101) | Flat duct DN 150; equivalent duct length up to Lmax 28 m; non-return flap with maximum opening pressure 65 Pa | Recirculation set CA 082 011 (the data sheet text also shows CA 082 010); vertical aperture of at least 25 mm behind the furniture back panel (50 mm suggested); outflow area of at least 440 cm²; charcoal filter removable from above |
Miele specifies a vent opening of at least 425 cm² and asks you to keep 25 mm clear if the air is routed between cabinet and wall. Gaggenau asks for an outflow area of at least 440 cm² with its recirculation set. A solid plinth or back panel can block that airflow, so plan the openings before ordering the cabinet.
4. What to plan in the cabinet
| Miele KMDA 7473 | Gaggenau CV 282 | |
|---|---|---|
| Depth below worktop | Unit height 200 mm including connection box (196 mm flush) | Immersion depth 227 mm |
| Cut-out / base cabinet | Cut-out 780 × 500 mm; unit 800 × 520 mm | Base cabinet at least 60 cm wide |
| Worktop depth | 600 mm recommended | At least 60 cm (recirculation) or 65 cm (ducted) |
| Space below | Drip tray and cleaning flap must stay accessible | At least 300 mm below the worktop for the 0.9 l overflow container; fixed from underneath; about 27 kg |
Miele’s drawing shows the extractor box occupying the top section of the base unit, so expect less drawer space there. Before you order the worktop, read our installation guide.
5. Performance and noise
The brands measure differently: Miele quotes air flow with sound pressure, and Gaggenau quotes sound power for extraction. We therefore list them separately and do not compare them head to head.
- Miele KMDA 7473 FL-A, extraction (EN 61591): 195 m³/h minimum, 538 maximum, 615 intensive; sound pressure 27 / 50 / 53 dB(A).
- Miele KMDA 7473 FL-U, recirculation: 145 / 465 / 510 m³/h; sound pressure 34 / 55 / 57 dB(A).
- Gaggenau CV 282101, extraction: 532 / 636 m³/h; sound power 70 / 74 dB(A).
- Gaggenau CV 282101, recirculation: 487 / 611 m³/h; sound power 67 / 72 dB(A); sound pressure 55 / 61 dB(A).
The newer KMDA 7473-1 has different values, so check its data sheet.
6. Care
- Gaggenau CV 282: the grease filter is removable and dishwasher-safe, as is the overflow container. Saturation indicators cover the grease and charcoal filters.
- Miele KMDA 7473: indicators for the grease and charcoal filters, and a CleanCover easy-clean interior. For cleaning intervals, check your model’s manual.
More on filters: cooker hood filter care.
7. Looking for a Bora alternative?
Bora is a well-known brand of hob extractors, but it is not among the brands in our hobs-with-extractor range. Miele and Gaggenau, which are, offer the same kind of product. Whichever brand you choose, the questions are the same: where will the air go, and is there enough cabinet space?
8. What we stock
Our hobs with built-in extractor category has 25 products:
- Miele (7), including KMDA 7272-1, 7473-1, 7676-1 and 7876-1 and CSDA 7001;
- Gaggenau (9): CV 282, 482 and 492, plus remote fan units;
- Galvamet (7): Perfecto 60/A and 80/A, and Quick Induction;
- Küppersbusch (1): KMI 8500;
- CATA (1): AS 750.
If you only need the hob, see induction hobs and all hobs. For a conventional extractor, see cooker hoods and integrated hoods.
FAQ
Is a hob extractor as good as a hood?
It depends on your layout, the duct run and whether you duct or recirculate, so we do not rank them. Manufacturers also measure performance differently, so figures from different brands cannot be compared directly.
Can I use a hob extractor without a duct?
Yes. The Miele KMDA 7473 FL-U and the Gaggenau CV 282 with its recirculation set clean the air with a charcoal filter. They still need the vent opening: Miele specifies at least 425 cm², and Gaggenau at least 440 cm² of outflow area.
How high is the unit under the hob?
The Miele KMDA 7473 unit is 200 mm high including the connection box. The Gaggenau CV 282 has an immersion depth of 227 mm and needs at least 300 mm below the worktop for the overflow container.
How do I clean the filters?
The Gaggenau CV 282 grease filter is dishwasher-safe, and both brands show filter saturation indicators. For other models, follow the manual.
Read next: induction hob explained · cooker hood buying guide · hob buying guide · cooker hood filters