- Extractor fan experts required
I to no longer yearn for mechanised farm machines……
Fan ducting :
Are you going to put some kind of self sealing grille/louvre on the external wall outlet? the fan outlet in our kitchen opens very easily when the wind blows against the gable end sending a draught into the kitchen.
Dont see the ducting length being an issue.Posted 4 years agospooky_b329Member
Our place has a cooker hood but its just for looks as it simply recirculates…not even a charcoal filter in it.
Down to B&Q, they do expandable metal duct that you stretch out, much cheaper than rigid stuff. It goes straight through the loft, if cabinet tops I’d have used the rectangular stuf.
3 metres with two 90 degree bends is fine on mine, prevents the kitchen steaming up when boiling unlidded pasta etc without the extractor on its middle setting.Posted 4 years agostevomcdSubscriber
Anyone know if there is also a maximum vertical rise on cooker hood ducting?
Renovating a barn in the Alps (poor me… 😈 ) and the previous owner has pulled a bit of a cheeky one by leaving us to deal with the downstairs neighbour’s cooker hood duct.
Leaving aside the fact that I don’t think the duct has been properly fire-protected where it passes through the slab separating the 2 properties, I think his intention that we should route it all the way to the roof (roughly 5m rise!) isn’t going to work. 5-6m long is pushing it for a horizontal duct, never mind a vertical one!Posted 4 years agoandylMember
3m should be fine. You are just extracting smells and steam from the kitchen so losses are important but not that important given that most extractors seem quite good compared to little bathroom ones. I would try and have a slight drop on the main section of pipe running out of the wall (assuming it going horizontal to prevent condensation running back into your extractor) and as above keep all the corners etc as few as possible, use smooth bore as much as you can and don’t go smaller than the min 100mm.
not an expert but done a few systems of different types including fume cabinets etc (where the experts have been stuck). But check for any regs and advice on installation stuff.
My one in the flat as a straight section running above the living room for 4m + 1m wall thickness and a temporary bit of extending section connecting it from the top of the standard cooker hood and it does extract and you do get steam coming out of the wall vent.Posted 4 years ago
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