Does a vented hood work as well as a passive hood when not switched on

londonTiger

A few questions about cooker hoods which the salesperson in currys was unable to help.

1) with extracted hoods does the ducting let in cold air/draught during the cold winter months?

2) when the vent is not powered on will the filters work as effectively as passive cooker hoods.

3) how much wider should the cooker hood be in relation to the hob?

Ruski

Very good Miele site here should answer all of your questions.

HTH

Russ

bridgedino

If it's a gas hob then the hood clearances from directly above the hob should be around 760mm

Ant555

londonTiger wrote: »

1) with extracted hoods does the ducting let in cold air/draught during the cold winter months?

Not in my experience, the vent on the outside wall has flaps that keep it closed. If the wind is blowing then I can hear it open and close every now and then but the draught definitely doesn't seem to cause a problem in the kitchen.

We have something similar to this on the outside wall
http://www.xtremewholesale.co.uk/media/catalog/product/cache/1/image/280x280/86ca6416110b7a08184c045d3e2b4ed9/w/a/wall_vent_gravity_flap.jpg

londonTiger wrote: »

2) when the vent is not powered on will the filters work as effectively as passive cooker hoods.
?

I am not sure if the filters would do any work at all on my particular hood if it was off. Steam does travel up towards the hood of course but I am not sure that much of it would end up being vented through the hood, into the pipe and then out of the wall (1.5m along the pipe) without it being switched on.
If the hood is off then my outside vent (shown in the pic above) is closed, if I switch the hood on then the vent immediately opens up due to the airflow.

Hope this helps

Ectophile

londonTiger wrote: »

A few questions about cooker hoods which the salesperson in currys was unable to help.

1) with extracted hoods does the ducting let in cold air/draught during the cold winter months?

There should be a self-closing flap on the outside to keep the draughts out.

2) when the vent is not powered on will the filters work as effectively as passive cooker hoods.

It won't do anything at all.

3) how much wider should the cooker hood be in relation to the hob?

Why would it be any wider? Mine isn't.

londonTiger

oh, so a hood without an extractor still has a fan on?

londonTiger

Ectophile wrote: »

Why would it be any wider? Mine isn't.

I'm guessing the steam doesn't go straight up and needs to be a bit more wider than the hob to catch more of the steamm

scottishblondie

londonTiger wrote: »

oh, so a hood without an extractor still has a fan on?

You get 2 types of cooker hood - extracting and recirculating. They both have fans, but an extracting one vents to the outside, whereas a recirculating one just filters the air (sort of) and blows it back out into the room. If you have the means to vent to the outside get an extracting hood, they're much more effective.

BlueC

scottishblondie wrote: »

You get 2 types of cooker hood - extracting and recirculating. They both have fans, but an extracting one vents to the outside, whereas a recirculating one just filters the air (sort of) and blows it back out into the room. If you have the means to vent to the outside get an extracting hood, they're much more effective.

Very good answer. One thing to add: if you are venting more than about 1.5m the steam will turn back to water and either collect in the vent, fall back into the hood and onto your hob, or dribble down the wall outside. Which of these depends on the vent angle.

Basically vents only work over very short distances.

burnsguitarman

Our kitchen was designed so the cooker and hood was on an outside wall,so a very short direct vent of 150mm. Its so effective that you know whats for tea, as soon as you pull up in the car. Always go for vented if possible!

londonTiger

Thanks for the advice. The cooker is probably 1 meter away from garden wall but total pipework would be 1m sideways and 0.6m vertical. Should be fine because I know someone who has a vented hood and their cooker is further away from outside wall than ours