Pre-heated, Filtered, Fresh air. Balanced Ventilation is key. Fresh air becomes a concern now that we tighten up our homes with insulation – sealing up all air leaks also prevents outside air from entering the building. Stagnant indoor air can quickly be contaminated with pollutants like dust, mould, pollen, radon and even carbon monoxide. Heat recovery ventilation can remedy this potentially unhealthy situation, which for instance helps sufferers from asthma – but it also lowers your utility bills.

As building efficiency is improved with insulation and weatherproofing, buildings are intentionally made more air-tight, and consequentially less well ventilated. Since all buildings require a source of fresh air, the need for HRVs has become obvious. While opening a window does provide ventilation, the building's heat and humidity will then be lost which is undesirable for the indoor climate and for energy efficiency. HRV technology offers an optimal solution: fresh air, better climate control and energy efficiency.

The rise of the asthma epidemic can be traced back to the oil crisis in the mid-seventies, the effect of which was a drive for energy efficiency. Increasing levels of insulation, combined with double-glazing and the sealing of buildings, dramatically reduced domestic ventilation rates, which in turn produced warm, humid and polluted indoor environments. Such conditions proved ideal for the colonisation and proliferation of the house dust mite. The need for HRV in the home has become obvious. All HRV's we install are SAP appendix Q elegible and use low energy DC motors to ensure the running costs are kept to a minumum.

Unlike air exhaust and other mechanical ventilation systems i.e. bathroom vent fans or kitchen range hoods, an energy recovery ventilator not only gets rid of air inside your home, it replaces it with fresh filtered and pre-heated outdoor air. As the indoor air is sent outside, a heat exchanger inside the ventilator extracts the heat and uses it to pre-heat the incoming fresh air. This balanced ventilation system ensures that the moist contaminated exhaust air is continuously replaced with temperature controlled filtered fresh air creating controlled and balanced ventilation.

Example:
The air inside a house should be “exchanged” with fresh air approximately 12 times in a 24-hour period.The fact is that on average a house has only five – or fewer – air

With up to 93% efficient heat recovery, the HRU ECO 4 outperforms the alternatives on the market in the field of energy efficient ventilation technology. With models for both house installations and apartment installations, there is a choice of Radio Frequency or hard wired options. Fitted with quiet, energy saving dc motors,the HRU provides high efficiency heat recovery through its sophisticated counterflowheat exchanger which is constructed of multi-triangular canals within a hexagon,to provide maximum surface area for heat exchange.Easily installed into the loft space, andweighing only 25kg, this balanced mechanical central supply and extractsystem not only recovers a large percentage of heat energy, but negates the requirement for background ventilators to be installed in the dwelling.

The HRU ECO 4 operates on a state-of-the-art three speed wireless controller, which allows a saving in installation costs, and allows the flexibility to install multiple switches in a single house. Alternatively, it can be operated using the familiar 3-mode control switch. It has low mode operation for night-time use, central mode for normal daytime use, and a boost mode for higher extraction rates around increased pollutant environments such as cooking and bathing. The advanced HRU ECO 4 system includes an integrated 100% fully automatic ‘summer’ bypass valve and frost protection device.

The heat recovery unit HRU ECO 4 is designed to be fitted in newly built houses, ideally positioned in the loft space. The unit can be re-configured so that the duct connections are opposed to their factory supplied positions, thus allowing the unit to be located in different orientations; although the unit must be fixed with the mounting bracket, to a wallwith a mass of no less than 200kg/m².

Maintenance of the unit is minimal with filters being cleaned 4-6 times per year and replaced at least annually. The heat exchanger should be cleaned every 6 years. Depending on the level of dust build up, the motor and fan blades should be cleaned periodically. The unit must be accessible to allow maintenance and inspection at all times. The fan used accumulates significantly less dust and must be cleaned once every four to five years of normal use.

The heat recovery unit HRU ECO 4 can be controlled by a wireless (RF) 3 speed control unit with timer. Two of these switch units are included within the fan packaging when purchasing the RF version, and additional RF switches are available. Wireless (RF) 3 Speed Control Unit with Timer. The heat recovery unit is provided with one wireless (radio frequency) remote control switch. The receiver for the control signal is fitted into the fan during factory production. The switch, which has a selfadhesive backing, should be located in one of the wet rooms; most likely the kitchen and bathroom, and can switch the unit between speed position one, two and three. Additional transmitters are available to allow the fan to be controlled from more rooms; the utility room, en-suites etc. The last used switch is the master. Advantages of Wireless Control:

A timer function is also included on the RF control switch. This timer can be used to switch the ventilation to the highest speed for a period of time. The advantage is that after the run-on period of the timer, the fan will revert back to its original speed. Pressing the timer button once will switch the fan to high speed for 10 minutes. Pressing the timer button a second time will switch the unit to high speed for 20 minutes and a third press of the button will switch the unit to high speed for 30 minutes. The timer function can be overridden at any time by pressing either of the three speed buttons.