Heat Recovery & Exchange Systems:

What if I don’t have a wood-burner?

The heat transfer systesm will work with other types of fires, such as pellet fires or gas. However, they are not suitable for homes with heat pumps.

How many rooms can I transfer heat to?

Heat transfer systems are available in 1,2 & 3 room kits. An extension kit is available to create a 4 room system. If a larger system is required, The Vent Shop is fully equipped to custom design a system for you.

What distance do the heat transfer kits cover?

  • One room kits can be extended to a maximum of 12 metres (6 metres supplied in kit).
  • Two room kits - a maximum of 21 metres (12 supplied in kit).
  • Three room kits - a maximum of 24 metres (15 supplied in kit).
  • One room extension kit comes with 3 metres of duct.

Why use acoustic insulated duct?

Due to the cooler temperature in the roof space, heat can be lost if the ducting is not correctly insulated. The acoustic insulation also reduces the system & air noise to an inaudible level.

How much power will the system use?

The one room system uses 46w, which is about half the consumption of an average size lightbulb. The two room system uses upto 80w & the three room system uses upto 110w.

Positive Air Pressure System:

How does the positive pressure system actually work?

In winter your roof space is generally drier and sometimes warmer than inside your home. This system is designed to draw this drier air, filter it and distribute via diffusers around your home. This system is controlled by the temperature in the roof space and when it is within the set temperature range the system will draw air from your roof space. This drier air mixes with the air in the house and reduces the level of moisture in the air of the house. At the same time it pressurises the house causing air to be forced out through gaps under doors, around windows etc.

What happens to the system outside of these set temperatures?

When your roof space temperature falls below your lowest set temperature (set on the controller by yourself or the system default setting of 10 degrees) your system will either turn the fan to low speed or off (set on your controller by yourself) if you do not have a heater installed. When the temperature in your roof space rises above your set highest temperature (set on your controller by yourself or by using the system default setting of 25 degrees) your system will do one of two things. It will either change the damper over and start bringing cooler air in from outside (if you have the summer feature installed) or turn the fan to low speed or off (set on your controller by yourself).

What does the building code recommend for home ventilation systems?

The NZ Building code requires a minimum of 0.35 Air Changes per hour (ACH). Smart-Vent systems are designed to provide at least 1 ACH in optimal conditions.

Will dust and other contaminants enter my home from the roof or outside?

No, Smart-Vent systems use high-grade filters to greatly reduce harmful particles entering your home. A high quality F7 hospital-grade filter captures 80-90% of fine pollens, dusts and allergens from the air, making it cleaner and safer to breathe. This level of filtration is a must for families with asthma and allergy sufferers.

What does the system cost to run?

The most common model (SV04S, 4 outlet system with summer feature) will cost as little as 15c per day to run. This calculation is based on a $0.14 kilowatt/hour electricity cost and is subject to consumer settings and duty ratio. The Smart-Vent 1kW heaters will cost 17c per hour to run, based on a $0.17 kilowatt/hour electricity cost.

Can I install this in my 2 or 3 storey house?

Yes, Smart-Vent systems can be installed into a multi-storey house. Best results are achieved by spreading the inlets between the storeys. The back of cupboards, wardrobes or other available voids would need to be used to run ducting down to lower floors.

Where should the outlets go?

We recommend that you place an outlet in your living areas and bedrooms. With regard to placement within each room, the outlets should be located away from any windows and doors so the air has time to circulate within the room prior to being expelled.

How long does it take to install a system?

From feedback we have received, a four outlet system without the summer feature should take approx. 3-4 hours to install. While a four outlet system including the summer feature should take approx. 5 hours to install. Please note: these times are based on an experienced electrician installing Smart-Vent into a single storey home with a large roof space.

Once installed, how often would I need to change my filter?

The system calculates % usage of the filter based on the fan speed and time in operation. The controller will keep you up to date with filter % usage and advise you when the filter needs changing. A Smart-Vent system operating on medium speed will take approx. 1 year before reaching 100% filter usage. Personal fan speed preferences will affect the % filter usage rate.