Browse Forums General Discussion 1 Jul 03, 2008 2:28 pm Hi everyone,
Once more your guidance will be greatly appreciated. We have the option of ducting rangehood to outside at an additional cost of $591. Note: Standard is rangehood is ducted to roof. Should we pay the extra so we get the rangehood ducted to outside? What's the benefit of ducting to outside? Or should i say what's the downside to ducting to roof? Thank you very much Re: Rangehood air ducted to outside or roof? 2Jul 03, 2008 2:53 pm I'd duct it to the outside. I can't imagine what ducting moist, oily, smelly air would do if it went into your roof cavity. After 4 years - we're in! Re: Rangehood air ducted to outside or roof? 3Jul 03, 2008 3:31 pm I am about to build with PD and they only charged me $394.
When i was thinking about it, a mate told me to do it because think of all the cooking smells in your roof as well as your ducted heating/cooling recycling the air through your vents. If your venting into the roof, than all that will be sucked back through your heating/cooling system. That was the main reason i got it installed. Hope this helps in your decision but $591 is a bit pricey and i would question that. Re: Rangehood air ducted to outside or roof? 5Jul 03, 2008 4:32 pm In some states it is mandatory that range hoods are ducted to the atmosphere - and for good reason.
The filters in a rangehood don't catch everything that is in the air they suck through. A range hood will be pumping the scavenged smoke, grease and steam out of the kitchen and into your roofspace if you don't vent it outside. Cheers, Earl Re: Rangehood air ducted to outside or roof? 6Jul 03, 2008 8:04 pm Ours is outside, done by the previous owner (European), and after living with it, I highly recommend it. Re: Rangehood air ducted to outside or roof? 8Jul 03, 2008 9:18 pm I queried this with our Sales Consultant (H3nl3y), and he told me it was to the exterior. Upon looking at all the display homes, there wasn't any vent to the outside from the kitchen along the exterior wall. Later I queried this at our colour appointment, and she thought it was vented to the roof space. She has put a note in for us to find out where it is. I guess when we do our Tender on Monday I will find out, and also how much extra it will cost.
I definitely want it vented outside. Our current one is vented back through the kitchen at the top of the rangehood, and then recycles through the ducted heating. The whole house stinks of food after a meal is cooked and annoys me no end! Thankfully not for much longer. Henley - Wilshire Mk 3 ... I love my house!! Site start: 4th Feb 09 Handover: 10th Sep 09 Blog: http://stormygirlscastle.blogspot.com/ Build Thread: viewtopic.php?t=7166 Re: Rangehood air ducted to outside or roof? 9Jul 04, 2008 12:55 am I was thinking about this the other day, as we will have sarking on the roof there is little ventilation for the moisture & smell to dissipate, I dont really want some ugly vent in the side of the house either and as well build using core fill blocks It makes it harde to create a vent.
anyone have pics of the types of vents used? and going through the roof even Re: Rangehood air ducted to outside or roof? 10Jul 04, 2008 8:21 am Ours is just a small (probably 6") galvanised pipe that pops out of the roof, with a little galvanised hat on it - bit like a small chimney. It also has lead flashing around it to blend with the tiles.
I'll take a pic & post it up over the weekend. It was done a couple of years ago when the previous owner did a new kitchen (manufactured date in the rangehood is 12/2005). I like being able to have a big pot of pasta boiling away on the cooktop, or even doing bacon & eggs in a frypan, and step back only a few feet, and there's no moisture, and no smell. The only downside is working in the yard on a weekend, near the evening, and the cooking smells waft out into the yard, creating the urge to stop work! I was concerned about 'fallout' on the tiles, but this doesn't seem to be an issue - either the filters in the rangehood do a good job, or the outlet is simply too high for the grease to stay suspended in the airflow. Re: Rangehood air ducted to outside or roof? 11Jul 04, 2008 8:41 am commodorenut Ours is just a small (probably 6") galvanised pipe that pops out of the roof, with a little galvanised hat on it - bit like a small chimney. It also has lead flashing around it to blend with the tiles. Good point make sure they but the chinaman's hat (it's what they are called - I'm not being rude) when we built our first house we knew enough to vent it outside but they hadn't put a hat on it. It took about a year for the right storm, with the right wind direction, and we had a nice puddle of water on the stove.....scary considering the water would have been dripping somewhere near an electric motor (not on but still)..... mmm....donuts Homer Simpson 1956- Links: Site Costs Ready Reckoner | H1 Addiction Medical Advice | Château TDL: The Backyard Re: Rangehood air ducted to outside or roof? 12Jul 04, 2008 9:42 am I'd be ducting to the outside.IMHO worth the extra money to make sure that the crap leaves the house.
Bugger. Need to check our own rangehood - not something I've even thought about until now. Re: Rangehood air ducted to outside or roof? 13Jul 04, 2008 10:57 am Hi everyone,
Thanks everyone for your advice. Thanks TDL for the picture, i have sent it to CSC and he confirmed that we will have a similar cover which is weather proof. As our kitchen (and therefore rangehood) is in the middle of the house, rangehood has to be ducted through the roof. CSC couldn't tell us the exact shape or size of cover though. Re: Rangehood air ducted to outside or roof? 14Jul 04, 2008 3:55 pm we will probably have to do it through the roof then, i remember when I was living in a unit complex they had the vents going through the wall outside into the common area. the asian family next door to me cooked up a storm and it just stunk the whole complex out, lots of moisture in their foods as you could see the black greasy juices dripping down the wall leaving a bit stain, it was gross. Re: Rangehood air ducted to outside or roof? 15Jul 04, 2008 8:22 pm If the rangehood is efficient, properly sized for the stove and properly ducted (no bends over 30 degrees) you should not get anything marking the wall. We've had 3 hoods ducted through the wall now without any problems. Prefer it to roof vents. Never liked extraneous stuff coming through the roof. Unless it's done properly there's always the risk of water getting in. The trend to central kitchens doesn't leave you a lot of choice in some houses though. Re: Rangehood air ducted to outside or roof? 16Jul 04, 2008 8:35 pm Ancient, do you know the recommnedations for sizes and run lengths.
My new hood will go up through my old roof, and in the cavity (below the floor above) I need to go sideways 1900mm to get to an outside wall. I think I can get away with a 30 to 40 degree bend. Steve Re: Rangehood air ducted to outside or roof? 18Jul 04, 2008 9:06 pm No, I'm just a consumer, but they should be easy to find -- places like the SMEG or Gaggenau websites have full specs for all their products and some tech/installation data. It should be in there and it would apply to all installations as far as ducting goes.
AFAIK, as soon as you put a bend in the ducting you start to cut down efficiency. I've been told 30 degrees is okay, as long as it's a gentle curve, doesn't crush the ducting and you, preferably, use flexible aluminium ducting not fabric. You can also get hard ducting with properly configured bends. Going over 45 degrees can mean a 60% loss of efficiency. Don't know how far you can run lengths before loss of efficiency gets too much but almost 2 metres (on top of the distance from the hood to the roof space) sounds like it might be pushing it. I was told a good test is to put the hood on its lowest setting then hold a piece of A4 paper, flat, on your fingertips about 2.5cm from the base of the hood. If it starts to lift out of your hands you have adequate suction. 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 6272 |