Cooker Hood Extrator needs to go through the roof to vent

A ordinary cooker or a range, what width of hood, the better hoods are more powerful & use 150mm ducting.

What the length of run you looking at for ducting.

 

Hi
Often the the extractor is in fact a filter that recirculate the air through a filter and not actually extract.

With extraction, especially vertical, condensation is the issue, the moisture inthe air will condense and trickle back

Regards
Peter

 

Better through the wall.

 

I agree. Core through the wall is also much easier to do than going through roof tiles.

PVC flexible ducting increases noise as air resistance is increased, as opposed to using fixed plastic ducting. Condensation would also sit in the ribs of flexible ducting.

David, does the extractor you purchased have a rear or top exit? As Kiaora said, extractors also come in a ductless option.

 

Not a problem if top, can use round bend or round to flat retangular bend.

 

Yes, but rear exit would be much neater. I have a top exit here with a half height kitchen cupboard on top of the extractor, so it cannot be seen.

 

You’ll need a ducting kit with a 150mm diameter.

 

Alright, no need to shout

 

Could you vent it through the eaves?



Can then put slight fall on ducting, allowing any moisture to run to the outside.

 

You could still go out of the wall with the metal cover still meeting the ceiling, it would be easier to do and you would not notice it from the inside.
As KIAB said, you can use a 90 bend and go straight out of the wall
I have done it with this style of extractor.

Are you sure you definitely want to go out of the roof?

 

Something like this would be fitted in replacement for roof tiles or slates:

http://www.roofingvents.co.uk/roof-terminals/ub47-insulated-roof-terminals-150mm.html

You could then run the ducting up to join this. It needs fitting properly and sealing around the tiles.

 

Didn't refresh the page so i didn't see this before posting, oops.

 

Take assessment of the roof gradient, you would ideally need to know the fall/degree of the roof to choose the right roofing vent. Also take note of how the roof is laid, is it slate only, paper and tile etc. as this will be important for working out how to properly seal and insulate the new hole you open up.

 

Sounds like it's going to be a long run to vent outside do use solid pipe instead of flexi ribbed stuff

Can also add a condensation drain to the vertical pipe up to roof. Generally available for 100, 125, 150 mm pipes and connect to 21mm overflow pipe and out through soffit

Insulate the pipe as well with some type of foil, bubble wrap blanket to help minimise condensation forming

Try to keep pipe run as short as possible and minimum bends. Depending on what tiles are on roof, a weathering slate will allow the pipe an exit whilst maintaining a seal