Building Warrant of Fitness


Buildings with certain safety and essential systems, known as ‘specified systems’ need a compliance schedule. These ‘specified systems’ ensure a building is safe and healthy for members of the public to enter, occupy or work in. It is the building owner’s responsibility to keep these features and systems working effectively and to the standards of the annual building warrant of fitness (WOF).


According to the Building Act 2004, building owners must make sure maintenance and report procedures are carried out in line with the compliance schedule. There are three key areas that require annual testing:

The building owner or air conditioning maintenance contractor will normally carry out all the weekly and monthly inspection, maintenance and reporting functions required by the compliance schedule for these systems.

Airlab Solution

Airlab can carry out the necessary testing on the three specified systems (listed above) required for the annual building WOF.

Airlab is also able to undertake HVAC Maintenance Audits for specified System SS9 – Mechanical ventilation or air conditioning systems. This is useful for clients that require independent IQP validation for maintenance carried out by the encumbant contractor.

Fire damper testing

In order to contain a fire, correct operation of fire dampers during a building fire are essential. Annually 20% of all fire dampers in a building must be tested – i.e. every damper is tested for correct operation every five years.

Outside airflow testing

SS9 requires the outside airflow rate to be inspected in accordance with Part 2 of NZS 4302. This states that airflow rates should be measured and recorded at installation under simulated “dirty filter” conditions. This ensures that design values are equalled or exceeded. It is also prudent (but not mandatory) to measure the total outside air to the building annually. This makes sure there has been no compromise to the air supply. The correct quantity of outside air is vital to maintain healthy air quality in occupied air conditioned spaces.