Cooker hood not connected to outside vent

Fingers Mcginty

Hello all. As the title says we have a hood over the hob. The discharge side of the fan isn't connected to anything. There is a vent approx 3 feet away.... could I just exhaust out that vent with some sort of kit?

Fingers Mcginty

See attached pic

sbsquarepants

I assume you could - but there's nothing too strange about it not venting to the outside world either. Most likely will have carbon and grease filters to clean the air before blowing it back into the room. The carbon filters can be pricey though is the only thing.

listermint

Vent it to outside, the cooked extractor is the type that would expect external ventilation. Recirculating the hot damp air back into the room is pointless. may aswell throw the extractor in the bin then

Fingers Mcginty

Ok so I just need to get some ducting and hook it up to the existing vent. Is there some some of kit you can buy for this?

Interested Bystander

I would get some flex hose and jubilee clips to attach to the extractor and some stainless / plastic tube to push through the wall penetration to attach the other end

Fingers Mcginty

sbsquarepants wrote: »

I assume you could - but there's nothing too strange about it not venting to the outside world either. Most likely will have carbon and grease filters to clean the air before blowing it back into the room. The carbon filters can be pricey though is the only thing.

It's a gas hob so defintely not the recirculating kind.

Interested Bystander

I would definitely exhaust the air

Fingers Mcginty

I don't really want to go messing with the external vent pictured below. Would it do just to run a flexible duct into the vent and just rest it up against the external one .

Interested Bystander

It may do but is that vent on the windward or leeward side of the building?
Something better might be needed if that side of the building is exposed. Last thing you need is a backdraught every time you switch it on.
It might be an idea to go into your local steel fabricator and ask them to make you a square (rectangular) to round transition to try and shore up the gap.

Butting the hose up against that opening as is would not be sustainable as its a cold bridge and should be sealed and insulated as well as possible. This isn't as complicated as it sounds. A lot of homes would be in dire shape if it weren't for expandable foam from a can
And if you have a bit more of that attic insulation, you can pack it in there around it too before sealing it up from the kitchen.

sbsquarepants

Fingers Mcginty wrote: »

It's a gas hob so defintely not the recirculating kind.

Much better to vent it outside so!



I had a hood much like it in my last apartment, there was no outside wall to vent it too, i would have been pumping it into the hall leading to the bedrooms! Carbon filters done a grand job, but they were pricey to replace, the grease filters were cheap.

Doop

Interested Bystander wrote: »

It might be an idea to go into your local steel fabricator and ask them to make you a square (rectangular) to round transition to try and shore up the gap..

Would this do the job... dealing with a similar issue myself!

https://ie.rs-online.com/web/p/spigot-plates/0432873

Or even somehting like this could be better?

https://www.electricalworld.com/en/ie/Domus-4-Rigid-Duct-Straight-Connector-with-Damper-and-Wall-Plate---4/s-5146-9454.aspx?PartnerID=73&utm_source=google&utm_medium=shopping&utm_campaign=Ireland&gclid=CjwKCAjw0On8BRAgEiwAincsHF49QYeejp3XHWIBps_BcyJI4jTR1MAZR9PoFOFkhwy4-wwuXXfpuxoCbr8QAvD_BwE

Tails142

The second one you posted looks better, you need a flapped outlet to stop a draft from coming back into the room when the fan is off.

To the op; you will need to change the external grille on that vent if you're going to use it, no way is there enough space for the extractor to exhaust through

Fingers Mcginty

Tails142 wrote: »

The second one you posted looks better, you need a flapped outlet to stop a draft from coming back into the room when the fan is off.

To the op; you will need to change the external grille on that vent if you're going to use it, no way is there enough space for the extractor to exhaust through

I'm actually going to get another hole bored in the wall and have it directly behind the hood. I think that's probabaly the right way to do it

Fingers Mcginty

There is a batten right where I need to bore the 6 inch hole. Does it matter?