Cooker Extractor Fan through roof

toonarmy1

i have a house with old stone wall, over 600mm in thickness. I have an extractor fan unit over the cooker. I was wondering can i bring this out through the roof using a slate vent as its impossible to go through the wall ?
The house is a bungalow so access to roof and ceiling over extractor is no problem.
Many thanks

GreeBo

Would be easier through the wall.

Get a 600mm bit and drill from inside to out.
Then get the longest diamond hole saw you can afford and drill from both sides using the initial hole as a guide.
Whatever is left you can just break up with a chisel bit on your drill.
As long as the holes are neat at each end it doesn't matter what the middle looks like.
Don't forget a slight downward slope to outside for drips

meercat

toonarmy1 wrote: »

i have a house with old stone wall, over 600mm in thickness. I have an extractor fan unit over the cooker. I was wondering can i bring this out through the roof using a slate vent as its impossible to go through the wall ?
The house is a bungalow so access to roof and ceiling over extractor is no problem.
Many thanks

Can you bduct into roof space and out the facia

toonarmy1

meercat wrote: »

Can you bduct into roof space and out the facia

there's no eaves overhang on the older cottage part of the house, its just the fascia up against the wall. the wall will be extremely difficult to get through as its solid stone, then studded and insulated board on the stud

Muahahaha

GreeBo wrote: »

Don't forget a slight downward slope to outside for drips

Are you referring to rain drips coming in if there is no downward slope? Like do they accumulate as a small puddle if it is flat or something? Doing a new ventilation hole myself soon so just interested.

colm_mcm

You’ll get condensation within the pipe.
We got a special roof vent that replaced a tile. It’s not great though as despite there being a flap, you still get wind blowing back.

listermint

What's all this left and right information.

Yes op you can bring it right up through the attic. Yes it is the easiest direction for you.

You need to buy insulated venting pipe. This is to stop condensation in the attic space.

Here's some here . It's the cheapest one I found and a good length

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F350612513650




And then buy a roof vent depending on the roof tile or slate buy the one that's appropriate. These can be bought here.


https://www.roofnstop.ie/



Also make sure to get long Cable ties to secure the vent pipe to the roof vent and the extractor fan output


I have both my kitchen extractor and shower one installed like this. Bungalow.

GreeBo

The roof is the easiest direction, but I would say it is a more complicated install that has much greater implications if done incorrectly.

Going through the wall is simple, it just takes effort, which a good SDS & diamond hole saw will take care of for you.

toonarmy1

listermint wrote: »

What's all this left and right information.

Yes op you can bring it right up through the attic. Yes it is the easiest direction for you.

You need to buy insulated venting pipe. This is to stop condensation in the attic space.

Here's some here . It's the cheapest one I found and a good length

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F350612513650




And then buy a roof vent depending on the roof tile or slate buy the one that's appropriate. These can be bought here.


https://www.roofnstop.ie/



Also make sure to get long Cable ties to secure the vent pipe to the roof vent and the extractor fan output


I have both my kitchen extractor and shower one installed like this. Bungalow.

many thanks for this reply, i have ordered 10m of insulated ducting and will get the roofer to put in the slate next week

do i run the ducting vertical from the extractor to the roof ?

GreeBo

toonarmy1 wrote: »

many thanks for this reply, i have ordered 10m of insulated ducting and will get the roofer to put in the slate next week

do i run the ducting vertical from the extractor to the roof ?

If you are getting a roofer to put in the vent then that is clearly the way to go....but since we are in the DIY forum I assumed you would be tackling that yourself!

listermint

toonarmy1 wrote: »

many thanks for this reply, i have ordered 10m of insulated ducting and will get the roofer to put in the slate next week

do i run the ducting vertical from the extractor to the roof ?

Pretty much.

Yellow_Fern

Old post but I am digging it up. Can venting a extractor duct to attic and rooftile meet regulations? I need to meet minimum rental regulations for a property and venting to a wall would undermine the aesthetics of the house considerably. I was told by a builder the ducting can be no more than 3 metre long, I guess the house is 1970s two story so perhaps the ducting would need to be 4 or 5 m to get to the roof, but from my reading of the regulations, what matters is flow rates. Could decent flow rates be achieved with a long duct?

Lumen

https://www.boards.ie/discussion/comment/120525771#Comment_120525771

This is for a cooker, right? Won't all the crap just condense and drip back down with a 4-5m duct?

Recirculating cooker hood?

Yellow_Fern

https://www.boards.ie/discussion/comment/120525876#Comment_120525876

Good point. The house is a private rental. A inspection company hired by the council says it needs to vent to the external air by means of cooker hood or extractor fan. In total, it is looking like 25,000 euro of works will have to done, the rent from the place is about 400 Euro a month. But we are not concerned about that. We just don't are just trying to preserve the aesthetics of the place.

Lumen

https://www.boards.ie/discussion/comment/120527068#Comment_120527068

That's a bit weird. It can't be ventilation for a combustion appliance because AFAIK you can't use a switchable extract for that. I'd take it up with the council - clearly new builds are going in all over the place with recirculating hoods (for air tightness reasons), and they are surely rentable.

Yellow_Fern

https://www.boards.ie/discussion/comment/120527406#Comment_120527406

Yup. I agree. I have new builds with recirculating hoods and they don't seem to meet minimum rental standards