Decentralised Ventilation NZ: Continuous Flow Systems Explained

Q: What is decentralised ventilation?

Decentralised ventilation uses independent units to supply fresh air to living spaces and extract moisture from wet areas. It avoids large central duct systems, providing flexibility and efficient airflow directly from outside.

Q: Is decentralised ventilation suitable for NZ homes?

Yes, it works well in many NZ homes, especially where roof space is limited or retrofitting central ducting is difficult. It offers targeted fresh air supply and moisture extraction with minimal disruption.

Q: Do decentralised systems need heat recovery?

Not necessarily. The focus is on continuous airflow and moisture control. By providing fresh air directly from outside and extracting at source, they maintain good indoor air quality without the complexity of heat recovery.

5-minute read • Updated April 2026

Decentralised ventilation systems provide fresh, filtered air directly into habitable spaces while continuously extracting moisture from service areas such as bathrooms and laundries.

Unlike centralised systems that rely on a single large fan and extensive ducting, decentralised units work independently to create a balanced, continuous flow of air throughout your home.

Key benefits of decentralised ventilation

Fresh air supplied directly from outside (not roof space)
Moisture extracted at source using smart fans
Continuous airflow throughout the home
Sensor-controlled operation based on humidity and air quality
No large duct systems required

Rather than relying on heat recovery, this approach focuses on maintaining consistent indoor air quality by controlling both supply and extraction of air.

How decentralised systems work

Supply units draw fresh air directly from outside, filter it, and gently push it into living areas. Meanwhile, extraction units in bathrooms, laundries, and kitchens remove stale, moist air at the source.

All units work independently, but together they create a continuous flow that dilutes indoor pollutants and prevents moisture buildup. Smart sensors adjust fan speeds in real time based on humidity, temperature, and air quality.

Decentralised vs centralised ventilation

Centralised systems: Single fan, large ducts, often use roof cavity air; can be complex to retrofit.
Decentralised systems: Individual units, flexible installation, fresh air directly from outside, easy to zone.

Decentralised systems are often easier to install in existing homes and provide more targeted control over air quality in specific rooms.

Related guides

Frequently Asked Questions

What is decentralised ventilation?

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Is decentralised ventilation suitable for NZ homes?

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Do decentralised systems need heat recovery?

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