Can I vent a cooker hood up a chimney?

[admin]

And if I can – which one do you reccomend?

I want to place the cooker in the chimney and vent about 30 feet straight up.

I don’t want to vent out through the wall as they are stone and about two feet thick.

Thanks

Alex

[kwatt]

The only way I can see it venting that distance is by using a remote motor setup, there’s an article I wrote in teh buying or installations section of “Articles & Help” on the site that should explain it.

In all honesty though, the best people to call for such a request is Elica as you’ll get sound advice from them on that.

Fair warning, it won’t be cheap to do it and a >£200 hood just will not cut that kind of performance requirement.

K.

[Martin]

Re: Can I vent a cooker hood up a chimney?

Surely the natural draft/airflow a chimney provides would be ideal for a cooker hood without further assistance from addition fans and hoses?

My only reservation would be not to fully seal off the chimney to facilitate such an installation in case of debris fall, rainwater and the avoidance of damp.

[admin]

Re: Can I vent a cooker hood up a chimney?

Martin

Thats what I thought. I intend to take the ducting right to the top of the stack and just put a cap over the pipe to stop water getting in. The rest of the chimney will be ‘open’ (again capped to prevent rain ingress). So I reckon I should have the same ‘suck’ as a normal chimney.

Alex

[alexa]

Only if you have a cross draft to replace the air that is trying to exhaust, and that the temperature is enough to cause the air to rise against any backdraught.

I a normal fire convection currents are very strong.

You convection current will be very sluggish.

[BobHope]

Re: Can I vent a cooker hood up a chimney?

any up vent more than 2.5 mts and you will have severe problems with the air flow as kwatt says it will need a motor unit fitted futher up to assist the flow.

Cheers Bob.

[Martin]

Re: Can I vent a cooker hood up a chimney?

Another thought occurs to me after much diliberating on the subject. A cooker hood as Ken and Bob rightly point out only need a short run of vent pipe to clear the air out of the kitchen. BUT it is always recommended to vent horizontally rather than vertically wherever possible and only then over short distances. The reason being is that a cooker hood extracts steam/water vapour and cooking fat and you cannot have yards of vent pipe going straight up a chimney for that reason alone, ‘cos what goes up will invariably come down 🙁

[Graeme]

Re: Can I vent a cooker hood up a chimney?

Apart from technical reasons why this should not be done, most manufacturers advise against this in the installation instructions, there are building regulation constraints that will also affect this type of installation. You may well find that the moist , greasy air could condense and run back down the ducting hose as water, into the hood and drip onto the hob.

[Martin]

Re: Can I vent a cooker hood up a chimney?

Graeme,

Welcome to the site, are you a trade Member I wonder?…and there is a new message (PM) waiting your attention 😉

Martin

[Washman]

Re: Can I vent a cooker hood up a chimney?

Hi

Do’nt forget that you can get down drafts from chimneys as well . which means things will get blown back into cooker hood from above .

Washman

[Author]

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