Stale, moist air is extracted from ‘wet’ rooms through grilles/cooker canopy (if fitted), passed through a heat exchanger to recover the heat and then the residue is exhausted to the atmosphere.

Fresh air is drawn through the same heat exchanger to be pre-heated by the recovered heat. This pre-heated fresh air is then distributed through ceiling mounted grills to ‘dry’ rooms, the air streams being kept separate to avoid any cross contamination. This results in fresh, dry warmed air circulating the rooms and providing a pleasant, clean, healthy living environment.


Up to 95% Efficient

Features and Benefits:

• Energy Efficient EC Fan Motors

• Integral Commissioning Panel

• Options For Boost Activation

• SAP Appendix Q Eligible

• Energy Saving Trust Best Practice Compliant

• Part F Building Regulations compliant

• British allergy approved filtered fresh air alleviating symptoms of
  asthma and hay fever

• Condensation control

• Quiet in operation


Models are available for loft, cupboard and cooker hob extraction. The size of the heat recovery system is determined by the size of the property.

A heat recovery system is designed to run continuously on a low speed 24 hours a day, seven days a week, and 365 days a year. The user has the option of a boost setting to be used as and when needed.

The heat recovery system is an excellent solution as it provides fresh filtered air, energy efficiency and a comfortable healthy indoor living environment all year round.

Single room ventilation unit complete with heat recovery is a perfect choice for fitting into small properties. This unit has the same principle as the larger heat recovery units, by extracting moisture laden air to heat fresh filtered incoming air and recovering heat that would otherwise have been wasted.

The single room heat recovery is designed to run continuously on a low speed 24 hours a day, seven days a week, and 365 days a year. The user has the option of a boost setting to be used as and when needed.

The single room heat recovery system is an excellent solution as it provides fresh filtered air, energy efficiency and a comfortable healthy indoor living environment all year round.

Features and Benefits:

• Energy efficient EC fan motors

• Integral commissioning panel

• Options for boost activation

• SAP Appendix Q Eligible

• Energy saving trust best practice compliant

• Part F Building Regulations compliant

• British allergy approved filtered fresh air alleviating symptoms of
  asthma and hay fever

• Condensation control

• Quiet in operation

A single central fan unit draws stale moist air from wet rooms through ducting to be extracted into the atmosphere. The extracted air is replaced with fresh air drawn into rooms via small trickle vents fitted in window frames. This application is designed to work subtly in the background with the provision to occasionally boost when required.

Current Building Regulations call for extractor fans in the wet areas of the property and trickle vents in windows.

Features and Benefits:

• Perfect solution for modern ventilation requirements

• Suitable for the small apartment up to the larger house

• Quiet in operation and economical to run

• Runs continually constantly extracting moisture and stale odours to
  create a healthier living environment

• Can be connected to a cooker hood, mounted in the roof void or at
  high level in a cupboard

• Can help keep the house cooler on hot days

Positive ventilation uses a mechanical fan to introduce a constant flow of fresh filtered air into the house in addition to forcing stale air to escape out of the building via natural leakage, and window trickle vents.

Features and Benefits:

• Systems for roof and wall application

• Introduces a constant flow of filtered, tempered air into the dwelling

• Constant flow of dry air which reduces relative humidity

• Create a positive pressure forcing the stale air to escape through
  the fabric of the building or purpose provided opening

• Once the unit is commissioned it will run automatically
  without adjustment from the householder.

• Provides the cheapest solution for many self builders

Both roof and wall models incorporate low energy D.C. fan motors and selectable fan speeds with running costs from less than 1p per day. A heater if required may be added.

Single Room Extract Fans are a well established ventilation strategy for refurb and new-build. Current building regulations now permit 2 types of extractor fan, Intermittent Extract or Decentralised Extract.

Decentralised Extract Ventilation provides continuous background extract ventilation to a property. Fans are installed in the kitchen and every wet room i.e. Bathrooms, Kitchen, Utility Room and W.C. Decentralised Extract Ventilation meet the requirement and also satisfy current and new part F & L building regulations in Ireland, England and Wales.

Both fans are silent running, 3 speed and designed to run continuously at one of a choice of 2 lower speeds (depending upon installation requirements). The user can then boost the fan speed to its maximum performance when required.

The heat recovery system was sited in the loft. A neat hole is cut to allow flexible ducting to connect the system to the ground floor. (Image 1)

Wood profile is fitted to conceal the ducting. (Image 2)

The heat recovery system has been fitted in the loft space. A kitchen extract valve is sited to extract cooking odours and condensation. (Image 3)

The heat recovery system has been fitted in the kitchen with an optional cooker hood, extracting cooking odours and condensation. (Image 4)

Wood profile above the window conceals duct runs that connect individual room valves with the ventilation system.

A flat refurbishment showing the wood profile fitted to conceal the duct run. It is possible to conceal wood profile in cupboards.

Moisture and condensation is extracted from the valve to outside the dwelling via the heat recovery ventilation system. Fresh air is drawn from outside and pre warmed through the heat exchanger to be introduced into the home.

Why is there a need for ventilation?

As a result of todays energy saving measures i.e. double glazing, cavity wall and loft insulation, homes have become sealed boxes with little or no natural ventilation. An average family can produce up to 16 pints of moisture in the course of everyday living. Without adequate ventilation, the moisture will penetrate walls, ceilings, bedding, clothing and mattresses, resulting in a damp, unhealthy living environment plagued by mould growth. Without a constant supply of fresh air in our homes, both the health of the occupants and the fabric of the building itself are at risk.


Are there other problems associated with inadequate ventilation?

As humidity rises and condensation occurs, an increase in mould growth and the dust mite population takes place within the home. Dust mites and their droppings are known allergens. Many people with asthma are sensitive to the droppings of house dust mites.


Is it expensive to operate?

The cost of running a typical heat recovery ventilation system that achieves approximately 95% efficiency will cost the equivalent of half the running costs of a 20 watt energy saving bulb.

It will cost approximately 44.3 pence a week.

Cost based on current energy prices (2013)


Must I operate the system throughout the year?

No as the system need only be operated when the windows are closed. Normal operation is from September to May. If for some reason, i-e security or noise the windows are kept closed, then it would necessary to operate the system continuously. It is possible to operate the system on extract only in the summer by simply switching the setting from heat recovery to extract only.


Where will it be sited?

Depending on the layout of your home the heat recovery ventilation system can be installed in the loft, the kitchen, a wardrobe or a cupboard, for example airing, boiler or coats.


Will it need maintaining?

Definitely, as manufacturer’s warranties are usually only valid subject to regular maintenance being completed on ventilation systems.

To ensure your system is performing to its full potential and eliminate the build up of dirt and other obstructions on filters, fan blades and ductwork a regular maintenance service is highly recommended. Obstructions can cause systems to underperform by up to 60%, costing the consumer money.


Would a dehumidifier help?

Yes by reducing moisture and condensation. However it won't change the air in your home or get rid of stale air smells. To do the job properly a dehumidifier would be needed in every room. Units vary at 300 to 400 watts; therefore you will certainly notice an increase in your electricity bill.


Is it noisy?

No as the two fans are contained within the insulated ventilation appliance (typically in your loft), therefore noise from the vents is virtually silent.


How does the system recovery the heat?

The system uses the heat from stale air before it is expelled from the house to warm the fresh air coming from outside. Fresh filtered air is drawn from outside, passed through a heat exchanger to be preheated and blown through vents into the main rooms of the house.