Ducting for Neff venting hob

Ballymoney

I've got a Neff T48TD7BN2 downward venting induction hob for our new kitchen and just wondered whether anyone been successful in connecting none branded 220x90 ducting to it for external extraction? Or does it have to be the Neff branded ducting which is proving to be impossible to buy due to stock issues?

EssexExile

If you can get a different brand of the right size then go for it. If it doesn't match exactly, that's what duct tape is for!

Another_Level

I would try to get oem ducting/fittings.

Siemens,bosch and probably other hob manufactures use the same ducting/fittings

Good luck 

Ballymoney

Managed to source the Neff part that connects the ducting to the hob but everything else is on a 3 week lead time which doesn’t work for us unfortunately.

Going to try some generic 220x90 plastic ducting (which is a slightly different shape to the Neff stuff) and use a tonne of duct tape and hope for the best. 

warwick2001

Is this one of those 'downdraft' induction hobs, with the built in extractor?

General question, are they any good? We're tempted to get one for our new kitchen, but if they're rubbish we'll stick to the overhead ones.

coffeehound

warwick2001 said:

General question, are they any good? We're tempted to get one for our new kitchen, but if they're rubbish we'll stick to the overhead ones.

I haven't used one, but since they are trying to work against gravity, they must need a particularly strong flow, and therefore free movement of air from outdoors into the kitchen, e.g. through an open window somewhere, to work effectively

Ballymoney

warwick2001 said:

Is this one of those 'downdraft' induction hobs, with the built in extractor?

General question, are they any good? We're tempted to get one for our new kitchen, but if they're rubbish we'll stick to the overhead ones.

I can only speak for the Neff T48TD7BN2 but it certainly looks stunning and reviews are extremely good (certainly not 'rubbish'). Mine is to be installed in a peninsula so I didnt want a large extractor fan above the worktop so this was exactly what we wanted.

As per my original post though, if you want the neff branded ducting be preapred to pay an extra £250-£300 on top of the £2k+ you pay for the hob. And buy it early to avoid stock issues.

I'll report back to give a verdict on the effectiveness of the none branded ducting though.

coffeehound said:

warwick2001 said:

General question, are they any good? We're tempted to get one for our new kitchen, but if they're rubbish we'll stick to the overhead ones.

I haven't used one, but since they are trying to work against gravity, they must need a particularly strong flow, and therefore free movement of air from outdoors into the kitchen, e.g. through an open window somewhere, to work effectively

The ducting goes to an external wall and out of the property via an external wall grille.

Another_Level

warwick2001 said:

Is this one of those 'downdraft' induction hobs, with the built in extractor?

General question, are they any good? We're tempted to get one for our new kitchen, but if they're rubbish we'll stick to the overhead ones.

They work very well even in recirculation mode, only seen a siemens  (think they are all very similar) and they do pull the cooking plum downwards.

Think there is a youtube video by roots kitchens. Remember something about humidity.

Keeping the extract piping as short as possible, avoiding bends if possible helps extraction and reduces noise. Just like any extraction system.
Pity their oem ducting/bends are so expensive   

Would i have one, yes 

coffeehound

Ballymoney said:

The ducting goes to an external wall and out of the property via an external wall grille.

Thing is, there needs to be a path for air to easily enter the building in order for the fan to remove a large volume at the hob.  In a modern draught-proofed home, the fan will struggle to work if there is no way for outdoor air to enter the kitchen, such as an open window

Ballymoney

coffeehound said:

Thing is, there needs to be a path for air to easily enter the building in order for the fan to remove a large volume at the hob.  In a modern draught-proofed home, the fan will struggle to work if there is no way for outdoor air to enter the kitchen, such as an open window

But surely that’s the case for a standard wall/ceiling mounted extractor fan too? 

I think they’d have to be in a very small, air tight space to struggle for air. A 5-10 minute blast in a kitchen isn’t going to be an issue.

coffeehound

Ballymoney said:

But surely that’s the case for a standard wall/ceiling mounted extractor fan too? 

I think they’d have to be in a very small, air tight space to struggle for air. A 5-10 minute blast in a kitchen isn’t going to be an issue.

It is indeed true for all extractors, but since the downward extractors also have the burden of working against gravity, they may well rely on a higher flowrate to be effective