Cooker extractor hood

me4many

I have a Belling single motor extractor. It's less than a year old and not used all that much really. It extracts to the outside through a short ducting... approx two feet at most. It is 75 cm from cooker top. The fitting instructions say 65cm to 75cm

The wall between cooker to and the fan gets very wed while cooking ie steamer veg etc.

Any suggestions on how I can make this fan more efficiently......

Thanks....

Rows Grower

I assume you mean cm instead of mm, it might just be the replaceable filter needs to be changed.

me4many

Yep..cm.

Very seldom used so filters a still like new...and they are the washable type when needed..

I can lower the whole fan/hoof down to 70 cm but it's a bit of work and am wondering if it would make a big difference...

These appliances are not very efficient anyway (in my humble opinion) but they should be able to take away a bit of steam...

RobertFoster

A lot of them have 3 fan speeds. Does yours, and are they all poor?

me4many

Yes three speeds...

It works a little better as you increase the speed....but the noise also increases...

Rows Grower

https://www.boards.ie/discussion/comment/122657565#Comment_122657565

I'd say double check the filter, one splash of oil could block it.

10-10-20

Two things:

A fan's extraction capability is only as good as it's exhaust capacity. Have a look at the fan exhaust and make sure that it's not blocked and is free-flowing. Something like this is best as it opens the whole exhaust path.

https://www.screwfix.ie/p/manrose-flap-vent-white-100mm-x-100mm/18561

Secondly, if the wall is cold and bare then it's going to condense more water on it. If not already fitted, fit a backsplash and you might that it improves things slightly.

mulbot

Can you check the top of extractor-should be 5 inch, though you might find it's a reducer fitted from 5 to 4 inch with the wall hole 4 inch. If that's the case you'll need to make the wall hole 5 inch and take away the reducer leaving a 5 inch to 5 inch flow.

me4many

I'll check that.

I know the hole in the wall is fitted with a 4" pipe . I can't get to the top of the extractor at the moment but I'm pretty sure I can see a reducer on top on the extractor. I'll verify that tomorrow..

Would that make a big difference.?

Tks

10-10-20

Hold on... check the exhaust vent first as even if it's 4in, you'll probably get better performance with a good exhaust flap than you would with a 5in vent and the same crap vent flap.

twignme

I would recommend you turn on your extractor at least five minutes before you start cooking so the air is already being drawn through.

ongarite

Either replace the extractor fan for a model with quieter fan with high CFM capacity or just suck it up literally with higher & noisier fan speed.

A steamer is going to generate a lot of water vapour that your fan on lowest setting can't cope with.

I replaced my cheap fan with model from IKEA which is considerably quieter & more powerful

10-10-20

https://www.boards.ie/discussion/comment/122658214#Comment_122658214

What now does priming the extractor do that just turning it on on-demand not do, please?

twignme

https://www.boards.ie/discussion/comment/122658299#Comment_122658299

I wouldn’t set myself up as an expert on this, but it’s my belief that the air which is extracted has to come from somewhere, just like positioning a vent in a room for a fire. By turning it on earlier, the circulation has begun and the air is being drawn from the room, over the cooking surface and into the vent, ready to take the steam with it. I can’t back this up with anything other than it works for me.

10-10-20

https://www.boards.ie/discussion/comment/122658316#Comment_122658316

I think that you're talking about setting up the air flow in a circular motion along a horizontal axis (so flowing from ceiling to back wall to floor to extractor) beforehand. I get what you're saying, and that works for heating a room, but it's not what we're looking for here as the extractor should just pull the rising heated air straight off the hob along with the embodied moisture without needing the airflow within the room to partake in the whole operation.

twignme

https://www.boards.ie/discussion/comment/122658348#Comment_122658348

I understand what you are saying, thank you. My question would be why is it recommended to use the volume of the room to calculate the extraction rate of the fan you need? I’m just curious where all that extracted air is coming from, if not the room?

me4many

The vent in the wall outside is one of those metal grill types...it's been there about 30 years...

kabakuyu

https://www.boards.ie/discussion/comment/122658395#Comment_122658395

Make sure its not blocked.

mulbot

https://www.boards.ie/discussion/comment/122657957#Comment_122657957

Yes it should