-
It would appear not! In fact, now it's all connected it really doesn't extract anything at all! Sitting here in smoke after frying a breakfast pork patty!
The hob instructions say a 150mm exhaust is required, but you can go down to 120mm. I didn't measure at the time, but I can't imagine the pvc duct hose is more than 100mm. The ceiling also has a glass lantern in it and I imagine the construction of the flat roof means it's only venting into a very small void - the flow must be awful now!
I think my immediate plan has to be to get a 150mm aluminium flexible duct and route it to a small side window when in use.
Longer term I need to decide how best to fit a proper 150mm duct and whether I try to fit it myself or get someone in. Looks like I have three options as it's a flat roof - go straight up and out through the top, go through the roof void to the back of the house, or install an exposed duct inside the kitchen (recently saw something like that in the kitchen thread).
Going through the roof void looks more complicated as there will be two or three joists to go through and the external pvc fascia. Going through the roof seems more diy friendly, but I don't want to create any leaks in the roof. Internal routing seems doable, but I'd need a core drill for the wall and to cut a 150mm hole in the side of the stainless shroud - also not sure if the wife would like the look!
1 Attachment
-
Familyman
-
If there's no way for air in the void to get out, you'd need a pretty strong pump in the hood to push the air in to it. So yeah, it's just not going to work, unless you vent the roof void externally somehow.
Flat roofs are bastards to keep working so I'd avoid putting a hole in that.
Best bet might be just to replace the whole lot with a recirculating hood type.
-
Go over the top of the cabinet out of the back wall and box it in. 150mm might be optimal but 100mm would be easier to manage and a lot better than what you have now.
-
What’s on the other side of the wall that the cooker hood is mounted on?
You can get rectangular ducting which might help keep things tidy.
220mm x 90mm rectangular ducting is equivalent to 150mm and is air brick vent sized.
Also if you decided to replace the cooker hood, you could get a matching cooker hood cabinet and run the ducting above that.
-
Do you have venting for air to come into the kitchen? I get better flow when I crack open a window.
Howard
Airhead
Acliff
Grumpy_Git
Nothing like trying so sort out someone else’s horror show, especially one that looks like it was supposed to be professional.
Most of these don’t vent outside because that requires all sorts of forward planning and actual competency :(
Usually they just fit a shitty recirculating extractor.
Does the roof void have any ventilation? It’s not an excuse but maybe that’s why they thought it would be OK, or at least not potentially damaging.