Cooker hood ducting

treecol

Just about to fit a new 100cm hood above our new range cooker. Previouslt there was just a 60cm hob before the refit. But above this was a hideous attempt at a Spanish chimney to house the old extractor. It was very tall & wide. The outlet of this extractor is on an outside wall, but along one sice of the outside vent is a wall at a right angle (bathroom wall). After taking the monstrocity in the kitchen down, it revealed the fact that this "chimney" his the fact that the outside vent was offset from the hob. The extractor was co nected to the outside vent via a flexable hose.
The new cooker hood is a modern one which is wide at the bottom with the usual thin chimney up to the ceiling. But this vent to the outside is offset. The range cannot be moved over to line it up with the vent. The chimney part which hides the ducting inside the extractor is too thin to hide any flexable ducting. If it were possible to sink flexable ducting into the wall then plaster over, as it'd be in an interior block wall, I think the ducting would be too thick. Any ideas?

thescouselander

I dont think it will be possible. A lot of high spec hoods use 120mm or 150mm ducting, either way that's a big pipe to bury in the wall. Can't you just cut a new hole to the outside in the correct place?

Also, using flexible ducting sapps air flow quite badly, it's always better to use solid ducting if you can.

Owain_Moneysaver

If you can't cut a new hole to the outside then get a local fabricator to make up a stainless steel 'chimney' with an offset in it to hide the duct. Or just box it in with plywood.

Hasbeen

Put the filters in it. do not bother with exterior extraction, all it does is suck out your central heating to warm the birds.

flashg67

Hasbeen wrote: »

Put the filters in it. do not bother with exterior extraction, all it does is suck out your central heating to warm the birds.

What about extracting steam/moisture from cooking that would then stay in the house?

Gloomendoom

Hasbeen has a point. If you simply blow warm air out of your house, it has to be replaced with cold air from outside the house.

I was advised to use the hood in recirculate mode with the filters and install a separate vent system incorporating a heat exchanger to minimise heat loss to the outside.

treecol

Thanks for the answers. We couldn't put the vent in line with the extractor as it would be gojng into the loo behind it! That's why the vent is offset from the cooker, it sits right at the right angle with the toilet wall doubt it would pass building regs these days. We could go straight up throuh the roof(it's a bungalow) but don't like the idea of disturbing the roof tiles. Now I also dislike the idea of losing all the heating out of the extractor too.

thescouselander

Couldn't you run the vent through the roof and out through the soffit (no need to disturb tiles)?

Keep_pedalling

Gloomendoom wrote: »

Hasbeen has a point. If you simply blow warm air out of your house, it has to be replaced with cold air from outside the house.

I was advised to use the hood in recirculate mode with the filters and install a separate vent system incorporating a heat exchanger to minimise heat loss to the outside.

I would have thought any loss of heat would be offset by the heat generated by the heat from the hob. Ours directly vents all that nasty moisture to the outside, and the house feels no colder for it.