Browse Forums Bathrooms and Laundry 1 Feb 26, 2015 12:06 pm Hello everybody! It's the first time I post a topic here. There is a (silly ) question about the exhaust fan. I have found Simonds to build a new house, and I get some planning papers now. There will be an exhaust fan on the ceiling in every toilet, but I am just wondering whether the fans vent into the attic/roof or to the outside? I lived in an apartment and their exhaust fan was installed on top of the window in the toilet, so I'm sure that the fan vent to the outside. Now I am not sure about that... because the planning papers do not tell that at all. Dose anyone find Simonds to build a double storey house? Do u know whether the fans vent into the attic/roof or to the outside? Re: Does a bathroom exhaust fan have to vent to the outside? 2Feb 26, 2015 12:43 pm Most builders vent the exhaust fans to the roof space/cavity these days, at least the majority of builders I know of. Depending on the location of your toilet/bathroom, you can cut a hole in the eaves and use a flexible piece of piping to vent outside via the eaves. Or ask the builder if they can vent to the outside if it worries you Dale - Building Newbie Proserpine, QLD Re: Does a bathroom exhaust fan have to vent to the outside? 3Feb 26, 2015 1:11 pm Yes, the cheap solution is to vent it into the roof space however it is good building practice to vent it to the outside if possible. You want to remove warm, damp air away from the timbers in your house to lessen the chance of mould and fungi growing inside your roof area. Stewie Re: Does a bathroom exhaust fan have to vent to the outside? 4Feb 26, 2015 2:24 pm You can vent your roof space with a whirley vent. http://www.edmonds.com.au/Products/Resi ... aster.aspx Re: Does a bathroom exhaust fan have to vent to the outside? 5Mar 01, 2015 8:16 pm From my understanding after reading the BCA ,it is permissible to vent into the roof cavity if no sarking is present if it is fitted it should be vented outside, I would always recommend to be vented outside Re: Does a bathroom exhaust fan have to vent to the outside? 6Mar 02, 2015 9:59 pm Venting outside is good practice, I seem to think there is something stated about the volume of space it is being vented into whether you can vent into joist or ceiling space. Also, something is to be said about whether or not the fan is strong enough to push through the ducting if it is a long run, especially the cheaper ones Re: Does a bathroom exhaust fan have to vent to the outside? 7Mar 02, 2015 10:23 pm Thanks very much to all guys above for your precious advice. We are going to discuss with the builder if the fans could vent to outside... Re: Does a bathroom exhaust fan have to vent to the outside? 8Mar 02, 2015 10:29 pm I was told that it's less of a drama venting to roof if you have tiles, as the steam can leak through the tiles a lot easier than with color bond. We got told at our prestart meeting that they'd have recommended a flumed exhaust if we went with color bond but because it was tiled, it was fine to vent into the roof. Re: Does a bathroom exhaust fan have to vent to the outside? 9Mar 03, 2015 8:05 am Even if you have a tiled roof kron the warm moisture coming out of a ceiling fan above a shower is a considerable volume. Some people have long hot showers and the rafters above the bathroom would end up dripping with moisture particularly on a cold morning. Not the best environment for timber. Even with an unsarked roof I'd imagine a fairly high percentage of that steam and moisture would remain in the roof space. As an aside, even with a tiled roof you should have sarking. Once again it is just good building practice and certainly helps keep the hot summer sun off the rest of your house. Stewie Re: Does a bathroom exhaust fan have to vent to the outside? 10Mar 03, 2015 9:45 am If you have a really well ventilated roof space (ie a few whirlybirds, ridge vents, soffit vents or gable vents) then it would be ok. Otherwise, I would duct to outside. Personally, I would always duct to the outside. That's just me. Also be sure to use an exhaust fan that has backdraft dampers. Otherwise, you will essentially have a 150-200mm opening between inside and outside which will allow the escape of warm air in winter to the outside atmosphere and the ingress of warm air in summer. Also make sure your builder leaves a nice big gap under the bathroom door for make-up air. If you rely on the openable window for your fresh make up air, in practice it won't work because in winter you will want the window shut. If there is no easy path for an equivalent amount of fresh air to enter your bathroom when the fan is running, it will create negative pressure which will eventually make the fan burn out prematurely - plus more importantly it won't do its job properly, which is to get rid of steam and odours. A good way to test if you have adequate make-up air is to close the windows, open the bathroom door, turn the fan on, then close the bathroom door. If you hear the fan change sounds then there is not enough make-up air and the fan is essentially trying to create a vacuum inside the room, which it is not designed to do. Building Services Engineer Renovating our 1960's modernist home in Brisbane https://forum.homeone.com.au/viewtopic.php?f=53&t=82091 My home office is hot with computer equipment running virtually 18 hours a day. When it gets unbearably warm I simply step out of my door into the living area which is… 0 5132 There may be answers here but can't find anything. I have a closed in veranda, four windows. North facing, just had sunblock blinds installed. A bit cooler (actually… 0 2983 How do you remove one of these ceiling air con vents? And is it possible to disconnect the duct joined to the vent from inside the house, without going into the roof cavity? 0 5947 |