Extractor fans are an important part of New Zealand’s Healthy Homes ventilation standard. Kitchens and bathrooms produce large amounts of moisture, so rental properties covered by the standards generally need suitable mechanical ventilation in these areas.
However, simply having a fan installed does not automatically mean a rental property complies.
This guide explains the Healthy Homes extractor fan requirements and what landlords should check in kitchens and bathrooms.
What Are the Healthy Homes Extractor Fan Requirements?
Under the Healthy Homes ventilation standard, kitchens and bathrooms generally need extractor fans that vent air to the outside, or a qualifying continuous mechanical ventilation system.
The purpose is to remove moisture generated by cooking, showering and bathing. An extractor fan may not be sufficient if it is broken, incorrectly installed or does not exhaust air outdoors.
Healthy Homes Kitchen Extractor Fan Requirements
A qualifying kitchen—meaning a room with an indoor cooktop—generally needs mechanical extraction to remove air from the property.
The extractor may be installed as a:
- Rangehood
- Ceiling extractor
- Wall-mounted extractor
- Other suitable mechanical ventilation system
For extractor fans installed after 1 July 2019, a kitchen fan or rangehood must have a minimum diameter, including ducting, of 150 mm or an exhaust capacity of at least 50 litres per second.
Do Rangehoods Meet Healthy Homes Standards?
A rangehood can potentially meet the ventilation requirements, but landlords should check how it operates. Some rangehoods extract air through ducting and discharge it outside; others simply filter the air and recirculate it into the kitchen.
A recirculating rangehood does not meet the requirement. Check where the extracted air actually goes.
Healthy Homes Bathroom Fan Requirements
A qualifying bathroom—meaning a room with a shower or bath—generally needs an extractor fan that removes moist air to the outside.
For extractor fans installed after 1 July 2019, a bathroom fan must have a minimum diameter, including ducting, of 120 mm or an exhaust capacity of at least 25 litres per second.
Landlords should check that the fan:
- Turns on and operates correctly
- Extracts air effectively
- Vents outside
- Has appropriate, undamaged ducting
- Meets the applicable diameter or flow-rate requirement
A fan that makes noise but moves very little air may require cleaning, repair or replacement.
Can a Bathroom Window Replace an Extractor Fan?
An openable window provides natural ventilation, but landlords should not assume it replaces mechanical extraction. The Healthy Homes Standards have separate requirements for general room ventilation and mechanical extraction in kitchens and bathrooms.
Do Existing Extractor Fans Need Replacing?
Not necessarily. Fans installed before 1 July 2019 must ventilate to the outside and remain in good working order. When they stop working, they must be repaired or replaced with a fan that meets the applicable requirements.
Landlords should avoid replacing a working fan solely because it is old without checking the current standard. Likewise, an existing fan should not automatically be assumed compliant simply because it predates the Healthy Homes Standards.
Where Should Extractor Fans Vent?
A qualifying extractor fan must remove moisture from the building. Ducting should not discharge moist bathroom or kitchen air into a ceiling cavity, roof space or another enclosed area.
Inspect the ducting and confirm where extracted air exits, particularly in older properties where earlier installations may have been completed differently.
Extractor Fan Checklist for Landlords
- Kitchen extractor fan is installed where required
- Bathroom extractor fan is installed where required
- Fans switch on and operate correctly
- Kitchen extraction vents outside
- Bathroom extraction vents outside
- Ducting is connected and undamaged
- Fans are not excessively blocked by dust or grease
- Existing fans meet applicable requirements
- Installation and product records are retained
Ask installers for fan diameter, ducting and flow-rate details in writing. Photographs, invoices and product specifications can also help document the property’s ventilation setup.
Extractor Fans and Healthy Homes Ventilation
Extractor fans are only one part of the wider ventilation standard. Habitable rooms may also need suitable windows, doors or skylights that open to the outside and can remain fixed open.
Read the complete Healthy Homes Ventilation Requirements for Rental Properties.
Check More Than Just Ventilation
Review heating, insulation, ventilation, moisture and drainage, and draught stopping with our guided free checklist.
Start Free Healthy Homes Pre-Check →
The tool is a preliminary check and is not official certification.
Related Healthy Homes Guides
- Healthy Homes Compliance Statement Checklist
- Healthy Homes Heating Requirements
- Healthy Homes Insulation Standards
Frequently Asked Questions
Do NZ rental properties need bathroom extractor fans?
Rental properties covered by the ventilation standard generally need qualifying mechanical extraction in rooms with a bath or shower, unless a valid alternative or exemption applies.
Does a kitchen need an extractor fan?
A room with an indoor cooktop generally requires suitable mechanical ventilation that extracts air outside.
Does a rangehood count as an extractor fan?
It can, provided it meets the applicable requirements and extracts air outside rather than only recirculating it.
Can an extractor fan vent into the roof space?
No. Qualifying mechanical ventilation must exhaust outside rather than releasing moisture into another enclosed part of the building.
Does having a window mean I do not need a bathroom fan?
Do not assume so. Natural ventilation and mechanical extraction are separate considerations under the ventilation standard.
Official Sources
- Tenancy Services: Ventilation standard
- Tenancy Services: Extractor fan ventilation tool
- Tenancy Services: Compliance statement
Final Thoughts
Meeting the Healthy Homes extractor fan requirements involves more than checking whether a kitchen or bathroom has a fan. Confirm required fans work properly, are appropriately installed and actually remove moist air to the outside.
Use our Healthy Homes Pre-Check NZ to review extractor fans alongside heating, insulation, moisture and drainage, and draught stopping.
