+ Learn More. Ventilation. C@H
Bathroom Extraction. Smartvent recommends a Manrose fan ducted to the outside of the house extracting at a rate of 10 -15 air changes per hour be placed in every bathroom. Manrose Extraction
Note: Section G4 Ventilation of the NZ Building Code states all buildings shall have a way of removing, among others, steam from bathing and showering to the outside of the home.