Browse Forums Kitchen Appliances 1 Aug 03, 2011 5:03 pm Hi folks Just wondering how the rangehood extraction fan should be finished off once it goes into the roof cavity? Ie, is the duct allowed to just sit open in the cavity (so essentially all cooking fumes and steam etc just sit in the roof space) - or does it have to be piped out of the roof space (not sure of the technical jargon)?? I was up in the roof last night and ours just has a duct (one of those large foil looking hoses) sitting open in the roof space. Is that acceptable practice? Does anyone know? HHCIB Re: Rangehood extraction into ceiling - question 2Aug 03, 2011 5:12 pm For me its a possible fire hazard. Smoke particles carry a tiny amount of oils and build up over time. Generally you can get a flue kit with a cowl that you can install to vent out of the roof. Building with Jandson Homes - Eclipse 18. http://adgnetworks.blogspot.com/ Re: Rangehood extraction into ceiling - question 3Aug 03, 2011 5:16 pm Our bathroom fans extract to the roof space but the kitchen extraction fan goes to the outside through a SS flue. that was the builders standard solution. It's fair enough for the bathroom vents going to the roof space as we have tiles so their is good ventilation but i agree with adgn about the fire risk, and the risk of smells would also concern me The Harder You Try - the Luckier You Get ! Web site http://www.anewhouse.com.au Informative, Amusing, and Opinionated Blog - Over 600 posts on all aspects of building a new house. Re: Rangehood extraction into ceiling - question 4Aug 03, 2011 5:34 pm bashworth Our bathroom fans extract to the roof space but the kitchen extraction fan goes to the outside through a SS flue. that was the builders standard solution. It cost us an extra $192 to flume the kitchen rangehood externally Re: Rangehood extraction into ceiling - question 5Aug 03, 2011 6:44 pm Thanks everyone. So I guess I am trying to figure out if it is allowed/compliant to just have it extracting into the roof cavity. Is it compliant? Is there a building code/guideline for this kind of thing? We are basically inspecting our property in order to prepare a report and this is an issue that I noticed (while up in the roof checking the insulation which is also a pig's breakfast ). Our bathroom exhausts go into the roof also and am not overly concerned about those but the kitchen one did strike me. HHCIB Re: Rangehood extraction into ceiling - question 6Aug 03, 2011 6:53 pm Quote from Chrisandkate in the bathroom thread : (Hope you don't mind me copying it here Chrisandkate) It is illegal (in Vic at least) to have a rangehood ducted to the ceiling cavity. It MUST be dusted to atmosphere or recirculated though the house. If recirc is chosen you MUST fit charcoal filters to the rangehood. If you have built after this was past your builder has broken the law and should be made to fix it at their cost END QUOTE Anyway, so that seems to answer my question (we are in Vic). I will confirm tomorrow with building commission to get my own facts straight - but looks like another thing to add to the list . HHCIB Re: Rangehood extraction into ceiling - question 7Aug 04, 2011 11:45 am We asked our SS this yesterday as ours opens up into roof cavity. It is because if you have a tiled roof there is adequit ventillation in the roof cavity, but if it is a tin/colourbond roof it needs to be ventilated to outside. Re: Rangehood extraction into ceiling - question 8Aug 04, 2011 2:11 pm newbuilder1 We asked our SS this yesterday as ours opens up into roof cavity. It is because if you have a tiled roof there is adequate ventilation in the roof cavity, but if it is a tin/colourbond roof it needs to be ventilated to outside. Based solely on this statement, your SS is an idiot OR trying to get out of it. Regardless of the roofing material, rangehood ducting MUST be vented DIRECTLY to atmosphere or recirculated via a charcoal filtered. It CANNOT be vented in to the roof cavity. The reason is to reduce grease build up on the under side of the roof and stop the insulation absorbing the air and grease. This in turn reduces the risk of fires started or fuel by grease in the kitchen. The relevant building code is AS4386.2.1996 I cannot find a copy to view as it seems you must pay to buy a copy, although your local council will have a copy of all building codes and may let you view it. @newbuilder1, I would go to your SS and tell him to read AS4386.2.1996 and rectify the problem, if he says no, tell them you will be with holding final payment until it is rectified in line with the standard. Re: Rangehood extraction into ceiling - question 9Aug 04, 2011 2:22 pm Ducting a rangehood into void spaces, ceiling or roof cavities is deemed a FIRE HAZARD. Correct venting of rangehoods is a legal requirement specified in AS1668 covering mechanical ventilation and requires “All exhaust air shall be discharged to the atmosphere”. Australian Standard, AS/NZS 4386.2:1996 Domestic Kitchen Assemblies refers. Cheers, Earl Re: Rangehood extraction into ceiling - question 10Aug 04, 2011 9:17 pm In WA most builders as a standard only duct kitchen rangehoods into the roof space, it is very unusual to find a builder here that automatically includes rangehood ducting to outside air. It is then up to the individual councils to advise whether they require external ducting for building approval, but roughly only half require it. The other half of the councils are happy to hand out a building licence with the rangehood only ducted into the roof space. I completely agree, it is a fire hazard and should be enforced. Re: Rangehood extraction into ceiling - question 11Aug 05, 2011 8:17 am CA3105 In WA most builders as a standard only duct kitchen rangehoods into the roof space, it is very unusual to find a builder here that automatically includes rangehood ducting to outside air. It is then up to the individual councils to advise whether they require external ducting for building approval, but roughly only half require it. The other half of the councils are happy to hand out a building licence with the rangehood only ducted into the roof space. I completely agree, it is a fire hazard and should be enforced. Its law in VIC and building inspectors pick on on it. I have since found out it is not law in WA Re: Rangehood extraction into ceiling - question 12Aug 05, 2011 11:33 am Definitely should be vented to the exterior. Peter Clarkson - AusDesign Australia www.ausdesign.com.au This information is intended to provide general information only. It does not purport to be a comprehensive advice. Rangehood extraction into ceiling - question 14Aug 05, 2011 1:07 pm newbuilder1 We asked our SS this yesterday as ours opens up into roof cavity. It is because if you have a tiled roof there is adequit ventillation in the roof cavity, but if it is a tin/colourbond roof it needs to be ventilated to outside. We have a colorbond roof but our kitchen exhaust just goes into the roof cavity.. Hmmm, interesting! Re: Rangehood extraction into ceiling - question 15Aug 05, 2011 1:18 pm Whether tile or steel - a kitchen exhaust fan (if not recirculating) should be vented to the exterior. There are other issues which are not covered under the reg's such as the ducting being able to be dismantled to remove grease build ups ( not that anyone periodically cleans the duct) & that it assists if the ducting is angled down towards the external vent point. Peter Clarkson - AusDesign Australia www.ausdesign.com.au This information is intended to provide general information only. It does not purport to be a comprehensive advice. Re: Rangehood extraction into ceiling - question 16Aug 06, 2011 8:02 pm How Hard Can it Be Quote from Chrisandkate in the bathroom thread : (Hope you don't mind me copying it here Chrisandkate) It is illegal (in Vic at least) to have a rangehood ducted to the ceiling cavity. It MUST be dusted to atmosphere or recirculated though the house. If recirc is chosen you MUST fit charcoal filters to the rangehood. If you have built after this was past your builder has broken the law and should be made to fix it at their cost END QUOTE Anyway, so that seems to answer my question (we are in Vic). I will confirm tomorrow with building commission to get my own facts straight - but looks like another thing to add to the list . HHCIB Re: Rangehood extraction into ceiling - question 17Aug 08, 2011 7:16 am Well . . . that one got past me. Wonder what the case is if the roof is sarked ? Peter Clarkson - AusDesign Australia www.ausdesign.com.au This information is intended to provide general information only. It does not purport to be a comprehensive advice. Re: Rangehood extraction into ceiling - question 18Aug 08, 2011 1:52 pm Well there seems to be some conflicting advice out there. I've listed on my 'defects' report just in case. I'll let you know outcome when the Building Commission come and inspect everything. 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