Ducting for kitchen cooker hood

[Mark]

Hi,

I am having problems locating suitable ducting for my new kitchen cooker hood. My old hood had very small rectangular section ducting which was woefully inadequate (100x50mm approx). As I have limited height and width to fit the ducting in I can't really go for wider rectangular ducting. I only have about 110mm by 130mm space to run the duct through the outside wall.

I've looked around in B&Q etc but I can't find anything suitable as their kits seem to be all rectangular. I think a round ducting would be better. All I could find was some 100mm round flexible ducting which I can't get to fit the hood. The hood does have a 150mm, 125mm and 100mm adapter but I don't know how to fix the hose onto this.

Can anyone help with with detailed advice please on this issue, like where to get the right ducting and exactly what to buy? The hood is approximately 1700mm from the outside wall and the only place to go through the outside wall is between a window lintel and an external extension.

Thanks a lot in advance. Mark

[Lobster]

Try

for item ref 15730, which is 3m x 125mm ducting: that gets you into the right section on the site: there you'll find narrower ducting, reducing adaptors, everything you might need for this.

If you can use the 125mm OD stuff that will be better than 100mm - the concertina-like ducting will squash a bit, so maybe it will fit in your

110mm wide space

hth David

[look]

I've just bought some 125mm flexible ducting from

was fast - order online Friday delivered Monday am royall at which net

[Mark]

Thanks for the advice. I'm still not sure how to join sections of ducting together. The 100mm flexible ducting I have won't fit on the adapter that I have.

Cheers, Mark

[Mark]

Also - what should be used to duct through the cavity wall to the outside?

Thanks, Mark

[look]

Measure the adaptor diameter and choose your ducting size, secure with large "jubilee type" clips

I am sure you can buy joining pieces and the wall/plate to go through the wall, You may find more choice of wallplate/grill in 100mm(4") , you an get adaptors.

Look at the links provided and you should see what you need.

IME local merchants only stock 100mm, so you have to use mailorder.

Robert royall at which net

[Lobster]

Have you got a matching ducting/adaptor pair? It should be a pretty tight fit - you need to 'screw' the flexible ducting over the end of the adaptor or ducting before you use a jubilee clip to hold it in place.

Neatest solution is to fit a length of solid ducting through a round hole in the wall; it should be flush with the outside surface of the wall when you're done. It wants to slope slightly towards the outside to encourage condensation to flow out rather than in. You then fill in any space around the ducting with mortar to make a sealed, firm, neat job. Next day you can fit a grille to the wall outside; this will have a male 100mm diameter bit which will fit snugly into the ducting you've fitted (but you still fix it firmly in place with screws.

On the inside wall, I usually just let the ducting protrude by an inch or two, and fit the flexible ducting over the end of that (it's usually all hidden by boxing anyway).

David

[Mark]

I tried to fit the flexible ducting over the adapter but it just damaged the plastic on the ducting. However I have seen something on BES now that might do the trick: "Threaded Hose Connector with Spigot" (Part No. 11427).

I'll try this. Thanks for the help.

Mark