FAQs

Question 1

What airflow rate do I need for a small Auckland bathroom?

Accepted Answer

Aim for 15–25 air changes per hour. A 2 × 2 × 2.4 m bathroom (9.6 m³) typically needs a fan rated around 200 m³/h (55 L/s). Always round up if in doubt.

Question 2

Can I vent an extractor fan into the roof space?

Accepted Answer

No. NZ Building Code Clause G4 requires moist air to be exhausted outdoors. Venting into the ceiling cavity leads to condensation and potential mould in the roof structure.

Question 3

Are heated towel rails expensive to run?

Accepted Answer

Modern rails use 60–120 W—similar to a standard light bulb. Running costs average $0.20–$0.40 per day if left on eight hours, and timers further reduce energy use.

Question 4

Do I need a separate heater if I install underfloor heating?

Accepted Answer

Underfloor heating provides consistent background warmth, but many homeowners add a quick-boost option like heat lamps for instant comfort after showers.

Question 5

How do I know a product is compliant with NZ standards?

Accepted Answer

Look for a Supplier Declaration of Conformity (SDoC), electrical safety markings, and IP ratings appropriate for your bathroom zone. Reputable suppliers on ArchiPro provide all documentation on request.

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