Fantech Home Ventilation

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So What is Positive Input Ventilation?

Benefits of input ventilation

It is a concept to deliver fresh filtered air into a property at a continuous rate.

Did you know...

  • Tens of thousands of homes across NZ benefitted from having a PIV unit installed?
  • It the second most popular method of ventilating homes after intermittent extract fans?

The reason is...

The air in your home could be making you ill In addition to the 50 liters of moisture that an average family produces per week through cooking, bathing, ironing etc, a concoction of other contaminants is present in the air within our homes.

These can have a detrimental effect on the fabric of our homes and the health of our families. With improved building features in our homes, such as cavity wall insulation, double glazing and draught proofing, ‘natural ventilation’ is prohibited. Stale, contaminated air is trapped causing streaming windows, which ultimately leads to musty smells, dampness and mould growth.

The Solution...

The solution is Positive Input Ventilation (PIV). The EnviroVent positive ventilation units are sophisticated whole home ventilation and condensation control units. By drawing in fresh, filtered and clean air from outside, the units gently ventilate the home from a central position on a landing in a house or the central hallway in a flat or bungalow.

Moisture laden air is diluted, displaced and replaced to control humidity levels around 55%. This significantly reduces or eliminates surface condensation, the main cause for mould growth. With lower humidity levels, dust mite populations are also substantially reduced to provide a significant improvement in the health of asthma sufferers and general indoor air quality. Positive Input Ventilation is also available for flats and apartments.

How it works

Shortly after the unit is installed

Shortly after the Postive input unit is installed

The unit gently ventilates the home with fresh air. Air is pushed back down into the house and redistributed. Humidity is replaced and diluted to leave a healthy, fresh and clean environment to live in.

House is now free from contaminants

The house is now free from contaminants

The units transform a stagnant, stale atmosphere into a fresh, healthy and condensation free environment.


To cure Positive Input Ventilation problems for good we recommend these solutions...

Loft Mounted Unit
Loft Mounted Unit

Great for solving condensation problems in properties with a loft.

Wall Mounted Unit
Wall Mounted Unit

Ideal for solving condensation problems in flats, apartments and properties without a loft.

MIV® Air Source
MIV® Air Source

Ideal for solving accute condensation problems in multiple rooms. Has the facility to draw cooler air from outside in the summer.

Elta Group