Cooker hood extractor to ceiling extractor duct

[CrazeUK]

Hi all.

I have a cooker hood that currently filters and re-circulates air.

Just in front of it, there is an electric extractor which has flexi ducting that leads outside.

How do I add the outlet from the current hood to the room extractor, also now allowing a back flush of air?

 

[RrogerD]

I'd stick with your current setup tbh. Cooker extractors tend to clog up with grease very quickly. Cleaning that ducting out could be quite difficult. At least as it is you can see when it's getting dusty / dirty / mucky and can attend to it.

 

[jj4091]

Do you have access to the space above the fans where the ducting is. If you do then unfortunately I would say exactly the opposite to RogerD and say remove the duct from the fan and connect it to the cooker hood, you won't need both.

 

[CrazeUK]

Do you have access to the space above the fans where the ducting is. If you do then unfortunately I would say exactly the opposite to RogerD and say remove the duct from the fan and connect it to the cooker hood, you won't need both.

Unfortunately not. We are in a flat.

It would be possible to cut a hole above the canopy box.

 

[CrazeUK]

I'd stick with your current setup tbh. Cooker extractors tend to clog up with grease very quickly. Cleaning that ducting out could be quite difficult. At least as it is you can see when it's getting dusty / dirty / mucky and can attend to it.

I understand the logic and worry too. The extractor hood has carbon filters on it so catches most of grease. Although you can see stains on the ceiling.

I just don't like ots recirculating the air as it's open plan.

 

[foxhole]

The extract fan will probably be on Flexi plastic which is totally unsuitable for heat from a oven extract.

 

[jj4091]

Unfortunately not. We are in a flat.

It would be possible to cut a hole above the canopy box.

If you cannot gain access to the trunking then anything else is going to have to be surface mounted and would be very unsightly. Plus is it your flat or rented, if the latter I'm not sure the landlord would be happy about making changes like you propose.

 

[jj4091]

The extract fan will probably be on Flexi plastic which is totally unsuitable for heat from a oven extract.

That is how most hoods are vented.

 

[foxhole]

That is how most hoods are vented.

Foil hoses are used , plastic melts .

 

[jj4091]

Foil hoses are used , plastic melts .

Sorry should have said some rather than most. I've seen a few that have plastic that has not been a problem.

 

[foxhole]

Sorry should have said some rather than most. I've seen a few that have plastic that has not been a problem.

Had plastic on my old kitchen , a dozen perforations over just 2m of hose , melted .

 

[jj4091]

Had plastic on my old kitchen , a dozen perforations over just 2m of hose , melted .

I've just been looking at new cooker hoods and see that they now come with metal flexi ducting rather than plastic.

 

[chirpychippy]

The current extraction in the ceiling may have a four inch duct straight out. 4 inch ducting is considered inadequate for kitchen wall/unit mounted extractor fans, preferring six inch or 5 inch minimum.
A four inch duct will make the extractor noisy, it can also burn the motor out due to forcing fumes through a small aperture.

Equally the appliance manufacturer won't uphold their warranty in such instances.