Ceiling exhausts located in bathrooms, kitchens and laundries are often unsealed allowing direct loss of heat to the ceiling cavity or outside. Exhausts should be sealed and preferably vented to the outside. Unfortunately older practice has been to install unsealed exhausts venting directly into the ceiling cavity. Not only are they a major route of heat loss, the air is usually moist, introducing moisture into the ceiling cavity. These installations should either be remedied or replaced.
DraftStoppa is a simple product that can be easily fitted over most exhausts if the ceiling cavity is accessible. The flaps open when the exhaust is turned on due to the air flow generated by the fan, otherwise they are shut sealing the exhaust fan. It fits most standard exhausts as well as the combination heater/light/exhaust units like the IXL Tastic (an adapting ring is required to allow it to sit on the unit).
Safety: If a DraftStoppa is to be used on a combination unit then the switch should be rewired to ensure the fan will always come on when the heating lamps are activated to avoid overheating around the lamps.
DraftStoppa TopHat is a good solution costing around $140 (Neco).
Other self sealing exhausts and combination units are available at most hardware and lighting shops. IXL Tastics are available as a sealed unit from hardware stores and good electrical appliance stores. Lighting shops tend to sell only sealed and vented exhausts and combination lighting/exhaust/heating units.
Odourvac is an alternative system to the traditional ceiling bathroom ventillation system. It vents directly from the toilet bowl and directly overhead from the shower with a sealed exhaust and ducting out to the closest eaves.
Becks Pty Ltd Electrical
61 Dowling Street
Launceston TAS 7250
Ph: 6331 3766
30 Patriarch Drv, Huntingfield
ph: (03) 6229 1148
Major Air Pty. Ltd.
7-9 Wilmot Street, S. Launceston,
Ph (03) 6344 6888
3/66 Sunderland Street, Moonah
Ph (03) 6273 6455