Browse Forums Kitchen Appliances Re: Rangehoods (ducted to exterior) 22Nov 27, 2008 9:29 pm hey, everyone,
i asked PD at tender, first they say they don't do it - only do it to single story houses, - i was astound!! i experssed my surprise, and disappointment and told them that i saw other builders do it, the girl said she will ask, she came back later and told me that they will. but as to how they are going to do it, i am yet to see, as somebody has just said, i will ask them to write in detail how. it si so unacceptable that at this days and age, they don't duct it outside. nh Re: venting rangehood to outside 23Nov 28, 2008 7:10 am jspitz We are building with M and were initally told that we would be charged $250 or so to vent outside. I rang up Baumatic who supply the rangehood and oven and they stated it was illegal to have the rangehood vented to the roof space. I also read the standard specifications list of M and it stated two storey homes are "externally vented". I stated both of these things to M and they are now not charging us for venting outside-but i think they might have if i hadn't made an issue of it. Of course M would, if they could get 1c out you they will. Re: Rangehoods (ducted to exterior) 24Nov 28, 2008 7:43 am Back Pocket We are building a single storey with PD, it's costing us $175 to duct the rangehood externally through the roof. I was charged $395 to do it with PD and when they finished my house I got up into the roofspace and discovered that they didn't even do it - the rangedhood just ducts into the roofspace through a hole in the plaster about 100mm diameter. I'm trying to get them to come back and fix it.. Re: Rangehoods (ducted to exterior) 25Nov 28, 2008 4:18 pm Ours is vented externally - looks identical to Matt's....and we didn't pay any extra.........ssssshhhhhhh , maybe they forgot to charge us !!!!!! We've also asked - a few times now - about having the main ensuite also vented externally, which they keep saying they will do, in the same way that the rangehood is done....but we're still waiting - over a week after end of contract Solidarity, not solidity.......The Lexicon of Life Re: Rangehoods (ducted to exterior) 26Nov 28, 2008 7:48 pm Petal
how did they do yours? through the floor space between groud floor and 1st floor? then you would have to have a bend, i mean a turn towards the external wall? let me know how yours was done, plzzzz. before i saw your post, i was just thinking i may move the whole stove into the pantry and duct through the pantry window nh Re: Rangehoods (ducted to exterior) 27Nov 28, 2008 8:16 pm NO idea, sorry- that's DH's department!!!!!!!!!!! Ask me about colours and taps (!!! !!!) not structural stuff!!!!!!!!!!!! Solidarity, not solidity.......The Lexicon of Life Re: Rangehoods (ducted to exterior) 28Nov 29, 2008 7:03 am An alternative way to vent hoods without going into a roofspace, or if the roofspace is inaccessable is to run the duct along the tops of the neighbouring wall units and out an adjacent wall.
The duct is either then boxed in with board and painted or concealed by a planned bulkhead. If you have a canopy rangehood it is often possible to run the duct through the wall behind the hood into the adjoining room (often a laundry or bathroom) and again box it in and run it along the wall to the external vent. Cheers, Earl Re: Rangehoods (ducted to exterior) 29Nov 29, 2008 11:37 am No offence but for a kitchen designer that's a surprising statement. It is not a good idea to run external rangehood ducting any further than a maximum of 2 metres, whether in a roof space or in bulkheads, and it's a really bad idea to have ducting with bends/right angles.
When houses are designed with kitchens (stupidly) sitting in the centre of a house and not on an external wall I suppose it's unavoidable but given the amount of venting efficiency that's lost you might just as well forget about ducting altogether and use one of those (very inefficient) hoods that recycle the air. Every rangehood manufacturer says much the same thing: every extra bend/angle in the duct can reduce rangehood efficiency by up to 30%, as much as 50% with poorly designed hoods. A correctly vented hood will either go straight out through the roof or have no more than 1.2 metres of flexible METAL ducting out to an external wall, with a gentle curve rather than an abrupt angle. If an angle is essential because of construction it needs to be no more than 30 degrees. Oh, and if you want a rangehood to work properly (as in actually catch ALL the steam/odours) get a hood 30cm wider than your cooktop -- e.g., a 1200mm hood for a 900mm top. Re: Rangehoods (ducted to exterior) 30Nov 29, 2008 2:57 pm As a kitchen designer I frequently encounter environments that are less than ideal - often one has to provide a compromise to optimum design (and that is without even having to deal with the clients preferences).
I would love to only work to best practice, but not everyone is in a position to rebuild their kitchen area and or house to cater to an ideal specification. I often have to deal with long narrow kitchens with the window on the narrow wall (of course) and the oven/cooktop halfway along one of the other walls. I will always try to get a client to put their vent straight up through the roof in this situation - getting them to accept the logic of my rationale is another story - I am amazed how many people love to get my advice until it conflicts with their preconceptions, opinions or what their sister told them. Anyway, I believe one of the issues in this thread has to do with kitchens below another story, where going straight up just isn't going to happen, and my reply was intended to provide some advice about how to deal with the existing circumstances. I understand your well made points about loss of efficiency through bends (that flexible piping is a reall power thief as well) but creating any ducting run using three 30 degree bends is not always going to be possible in the available space; I appreciate your argument here is that at this point one may as well not use any hood at all, but I would also put forward the suggestion that even 50% of full pressure could be seen as being preferable to not having any vented exhaust at all? I know that if I was given the choice of no vent or reduced efficiency I would definitely take the latter. Further to the issue of reduced venting pressure, I believe that there are also possibilites for installing secondary fans in long or particularly inefficient ducts - I can't comment about that topic specifically as I don't have any direct experience with one of these systems but this could also be worth investigating. Cheers, Help with my kitchen rangehood. 31Nov 29, 2008 3:48 pm Rather than start a new thread, I thought I would post my question here.
We are going to be buying one of these. https://www.appliancesonline.com.au/p-3 ... 605is.aspx It will be getting put in a bunnings flat pack kitchen. I will post a pic of the old kitchen so you can see what I have to work with. The cealing in this house as you can is cathedral. What would be the best way to flue the exhaust?? We are having overhead cupboards. Any ideas?? Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ If you choke a smurf... what colour do they turn? Re: Rangehoods (ducted to exterior) 32Nov 29, 2008 5:04 pm Strumer As a kitchen designer I frequently encounter environments that are less than ideal - often one has to provide a compromise to optimum design (and that is without even having to deal with the clients preferences). I would love to only work to best practice, but not everyone is in a position to rebuild their kitchen area and or house to cater to an ideal specification. Fair comment, and I agree compromises often have to be made in existing homes. But for the most part the people on this forum are building new houses and therefore shouldn't have to compromise. If they do the architect/designer is at fault. Strumer Anyway, I believe one of the issues in this thread has to do with kitchens below another story, where going straight up just isn't going to happen, and my reply was intended to provide some advice about how to deal with the existing circumstances. Again, fair comment and, again, if an architect/designer creates a floor plan for a 2-storey home that forces a hood to be vented through long runs of ducting (i.e., by locating the kitchen metres away from any external wall) then they should be drummed out of their profession and forced to live permanently in a kitchen that has no effective venting/control of cooking gases/odours. Strumer I understand your well made points about loss of efficiency through bends (that flexible piping is a reall power thief as well) Sure, but in saying what I did I was envisaging a canopy hood mounted on an exterior wall. In that case one only needs a very short length of 125/150mm flexible duct running directly from the hood out through the wall. The bend needed is usually no more than 10-15 degrees, which is more efficient than a 90 degree angle with solid ducting. If you have to go through the roof space then yes, square section ducting with angles is better -- as long as it's not too long and the 90 degree angles have 30 degree baffles in them. Shrug. You obviously can't achieve that if the kitchen is metres and metres away from exterior walls. Strumer I appreciate your argument here is that at this point one may as well not use any hood at all, but I would also put forward the suggestion that even 50% of full pressure could be seen as being preferable to not having any vented exhaust at all? Hmmm, I understand the argument but I'm not sure that I can agree. The problem is that even the best domestic rangehoods are not all that efficient. They're invariably a compromise between venting efficiency and noise levels (they're horribly loud now, any louder and nobody would buy them). If you further reduce that efficiency by being forced to use ducting that is outside the manufacturer's recommendations for either duct length or by changing the direction of airflow then it's arguable that you have reduced the efficiency by a sufficient factor to make it less efficient than those much cheaper hoods that rely on filters only to catch the gases etc. The problem here is that when it's ducting that's reducing the efficiency you are compounding the problem over time. All vented hoods work the same way: They suck air carrying grease, fat, water droplets etc through filters (which are themselves of variable efficiency) at sufficient pressure to keep that air moving until it's vented outside to the atmosphere. Not all the crud is caught by the filters so, if the ducting is inadequate/too long then some of it will not make it outside and be deposited on the ducting, mostly where the air has to 'go round corners' (air doesn't naturally do that!). Once there is a layer of grease there it's easier for more grease to be deposited. As that build up increases you reduce the efficiency still further until, eventually, you could be down to as little as 10% of rated efficiency within a few years. Given that you can easily pay up to $1800 for a good rangehood, more if you like, it seems counter intuitive to me to not maximise that efficiency. If you can't because of limitations in your kitchen design you might as well save the money and opt for a different solution. It also seems to me that, with so many homes having open plan kitchens that an efficient rangehood has become much, much more important than in the past when kitchens were invariably separate rooms. There are other reasons for getting it right too, including the increasing popularity of ducted air conditioning. Any hood/canopy that fails to catch the majority of cooking gases/odours and get rid of them before they dissipate into the room is going to allow those odours to be distributed throughout the house via the air-con return. Not pleasant. Strumer Further to the issue of reduced venting pressure, I believe that there are also possibilites for installing secondary fans in long or particularly inefficient ducts - I can't comment about that topic specifically as I don't have any direct experience with one of these systems but this could also be worth investigating. Sure, most restaurant hoods use that kind of solution. But whoever thinks to do it in a domestic situation? Most hoods are bought primarily on looks anyway. There are other solutions too. Stoves that suck grease-laden air down into charcoal filters (they don't work too well) and I believe someone has a 'silent' hood. I suppose, being an old bugger, I look at open plan kitchens with a jaundiced eye anyway and, when I see the trend to kitchens sitting in the middle of a home, I think somebody should shoot the designer. Re: Rangehoods (ducted to exterior) 33Nov 29, 2008 5:49 pm A/M, many people on this forum are working with existing houses - see the thread immediatly before yours for starters
But I agree with you about these modern kitchens in middle of house with no external wall - not only is ducted ventilation tricky but so is natural ventilation and natural light if you don't have a window Re: Rangehoods (ducted to exterior) 34Nov 29, 2008 8:58 pm I am liking this thread with a bit of a niggling debate going on
Similar to the WA daylight saving debate on a weather forum I am on the great thing about niggling debates is everyone can learn so much Re: Rangehoods (ducted to exterior) 35Dec 01, 2008 11:10 am I paid our builder extra to have ours vented externally. braveheart Re: Rangehoods (ducted to exterior) 36Dec 01, 2008 1:32 pm after reading some postings here, i am thinking whether we should ask the builder to move the stove to the pantry which is next to the external wall and has a window.
also our pantry is a BIG pantry. anybody tried and what do u think? nh Re: Help with my kitchen rangehood. 37Dec 01, 2008 3:02 pm MissMuffitt Rather than start a new thread, I thought I would post my question here. We are going to be buying one of these. https://www.appliancesonline.com.au/p-3 ... 605is.aspx It will be getting put in a bunnings flat pack kitchen. I will post a pic of the old kitchen so you can see what I have to work with. The cealing in this house as you can is cathedral. What would be the best way to flue the exhaust?? We are having overhead cupboards. Any ideas?? Not sure about the best way but I'd exhaust it directly up out of the overhead cupboard, through the ceiling and roof. You can get a rectangular gyprock box built around the exhaust duct to hide it. Maybe make the width of the box same as the rangehood. Re: Rangehoods (ducted to exterior) 38Jan 15, 2009 11:49 pm Was wondering if anyone could offer advice as to what would be the best rangehood for our new home?
Builder offers a canopy as standard, but l was leaning towards having a slide-out one, so l can have extra cupboards....our kitchen is in the centre of the home and thus has no external wall where the rangehood will go....After reading through this thread, l'm a bit worried that l may be making a mistake by choosing the slide out instead of the canopy?.... Re: Rangehoods (ducted to exterior) 39Feb 08, 2009 11:04 am haywgl I just got this reply from my CSC when I told her it was illegal to have the rangehood ducted to the roof space: "In relation to the vent for the rangehood, the steam is ducted out to an outlet to the exterior wall." Does this mean Im ok? haywgl, where or how did you find out that it is illegal to duct into the roofspace here in Victoria? I would like to make sure because I'm going in for tender with PD next week. Also, does anyone know if single story homes can vent to an external wall and not through the roof? Re: Rangehoods (ducted to exterior) 40Feb 08, 2009 1:45 pm Reaver,
We had a "tower" with an oven, pot drawer under and shallow cupboards over it to allow venting from the oven, in our current house. When we renovated the kitchen 2 years ago and pulled this out, we saw that it had caught fire on a number of occasions and this is because the original builders had vented it to the space between the floors instead of an external wall. When we saw how badly it had been burnt, we decided we were very lucky not to have the house burn down. The guys pulling out our kitchen said we'd never win tattslotto because we'd used all the luck we had. The new house is have ducting through the roof, not just to a cavity. No more chances for us or our children. So, not sure on the single storey bit, but we are not taking chances. Hi all, sorting out the ducted air con for a 350sqm double story house. Does this placement sound reasonable to you? Also, I plan to have 6 zones I think. Living room… 0 0 Hi all, sorting out the ducted air con for a 350sqm double story house. I think i plan to have 6 zones I think. Living room (mainly for entertainment so not used often),… 0 0 0 6251 |