Video | Agriculture | Confidence | Economy | Energy | Employment | Finance | Media | Property | RBNZ | Science | SOEs | Tax | Technology | Telecoms | Tourism | Transport | Search

 


Home Ventilation Competition Hots Up

Home Ventilation Competition Hots Up

A unique ventilation system, now produced commercially, reduces unwelcome condensation and keeps homes drier and healthier at a quarter of the cost of competitors.

Auckland electrical engineer John Wadsworth designed and built the ductless unovent home ventilation system for moisture reduction, and has patented it in New Zealand and overseas.

“This is a game changer,” says Mr Wadsworth, who established Unovent Limited in April this year. “Modern home ventilation systems have been around in New Zealand for 18 years and they have always been done with a ducted system.

“Mine doesn't need ducting or a large fan in the cavity of the roof, and it's simple to install and maintain. Importantly, it's just as effective in reducing moisture in the living areas and condensation on the windows,” he says.

Mr Wadsworth, formerly managing director of Honeywell New Zealand, developed a small, all-in-one vent and fan which is operated by a 12 volt lightweight power cable. The unovent unit includes a filter which can easily be removed from inside the room, washed and put back in place.

A standard three-bedroom house would have four units installed in the ceiling of each living area and are connected by the cables running to power supply plugged into a 240 volt switched socket located in the roof cavity or in a cupboard.

The traditional home ventilation systems comprise a large central fan and filter cartridge installed in the roof cavity and connected to a network of aluminium foil ducting which fit into ceiling-mounted room vents. The fan, usually between 80 and 200 watts, has to be big enough to overcome the resistance of the ducting and uses more power. The filter cartridges have to be replaced every two years at extra cost.

The unovent kitset for a three-bedroom house (four vents and integrated fans and filters, power cabling and plug connectors) costs $950 including installation and a comparable product is up to $4000, with installation taking one to two days.

Mr Wadsworth's invention uses less than $1 worth of power a month; whereas a 200 watt fan will soak up that amount in a day, creating a power bill of about $30 a month.

His system pulls dry air from the roof cavity and is mixed with the wetter air in the bedrooms, lounge and dining room, thus reducing the moisture content in the living areas. This also reduces condensation on the windows and moisture being absorbed into wall coverings, drapes and carpets which can lead to mould and mildew - key triggers for asthma and allergies.

“As well as having a healthy home with fresh, filtered air, you save on maintenance since the water doesn't run down the windows and rot the wooden surrounds, and the drapes or walls don't go mouldy and need to be replaced or repainted,” says Mr Wadsworth.

The unovent system can be kept running all the time during the cooler autumn, winter and spring months and shouldn't need to be used during the summer when condensation isn't an issue. The system has an optional thermostat which switches the system off when the roof cavity air temperature reaches, say, 28 degrees Celsius.

Mr Wadsworth sees big opportunities for his home ventilation system. “Over the past 18 years about 250,000 systems have been installed in homes in New Zealand. There are 1.4 million houses in the country capable of taking a ventilation system and we've got 1.15 million to go,” he says. “The modern double glazed, airtight home needs the system even more.”

Sitting in his new home in Pakuranga, Mr Wadsworth decided there must be a cheaper and simpler way of getting rid of all the moisture on his lounge and bedroom windows. He spent a year experimenting with three different ventilation mounting systems before deciding on the all-in-one vent and fan unit, which his company produces.

Following further research and testing, Unovent now offers a SourceControl humidity controller which is set and installed in the roof cavity to switch off the ventilation system during times of high humidity.

“The excess humidity of the roof cavity needs to be dealt with to avoid bringing the less helpful air down into the living area,” says Mr Wadsworth. “This happens when we get many days, one after another, of rainy or drizzly weather - even when the temperature outside and in the roof cavity is as low as 11 or 12 degrees Celsius.

“Most suppliers of home ventilation systems for moisture reduction never talk about this effect and what to do about it,” he says.

Mr Wadsworth began producing his kitset home ventilation system in April this year and it has already gone into more than 50 homes around the country.

Mr Wadsworth graduated from Canterbury University with a Bachelor of Engineering Honours degree, majoring in electrical engineering. He was the branch manager for Hewlett-Packard in Auckland, group engineering manager for Holyoake Industries (Australasia's biggest manufacturer of air management systems), and worked for Honeywell NZ for 16 years, being managing director for most of the 1990s.

He was also director of Honeywell Pacific's sensing and control group, a fellow of the New Zealand Institute of Directors, and was awarded the Paul Harris Fellow for leadership while a member of the Ellerslie Sunrise Rotary Club.

For more information visit www.unovent.com

ENDS

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Half Full: Dairy Payouts Steady, Cash Will Be Tight

Industry body DairyNZ is advising farmers to focus on strong cashflow management as they look ahead to the 2015-16 season following Fonterra's half-year results announcement today. More>>

ALSO:

First Union: Cotton On Plans To Use “Tea Break” Law

“The Prime Minister reassured New Zealanders that ‘post the passing of this law, will you all of a sudden find thousands of workers who are denied having a tea break? The answer is absolutely not’... Cotton On is proposing to remove tea and meal breaks for workers in its safety sensitive distribution centre. How long before other major chains try and follow suit?” More>>

ALSO:

Scoop Business: NZ-Korea FTA Signed Amid Spying, Lost Sovereignty Claims

A long-awaited free trade agreement between New Zealand and South Korea has been signed in Seoul by Prime Minister John Key and the Korean president, Park Geun-hye. More>>

ALSO:

PM Visit: NZ And Viet Nam Agree Ambitious Trade Target

New Zealand and Viet Nam have agreed an ambitious target of doubling two-way goods and service trade to around $2.2 billion by 2020, Prime Minister John Key has announced. More>>

ALSO:

Scoop Business: NZ Economy Grows 0.8% In Fourth Quarter

The New Zealand economy expanded in the fourth quarter as tourists drove growth in retailing and accommodation, and property sales increased demand for real estate services. More>>

ALSO:

Scoop Business: RBNZ’s Wheeler Keeps OCR On Hold, No Rate Hikes Ahead

The Reserve Bank has removed the prospect of future interest rate hikes from its forecast horizon as a strong kiwi dollar and cheap oil hold down inflation, and the central bank ponders whether to lower its assessment of where “neutral” interest rates should be. The kiwi dollar gained. More>>

ALSO:

Get More From Scoop

 
 
 
 
 
 
 
 
 
Business
Search Scoop  
 
 
Powered by Vodafone
NZ independent news