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Bathroom fan selection guide

A GUIDE TO SELECTING THE RIGHT FAN CBATHROOM EXTRACTOR FAN SELECTION GUIDE FAN REGULATIONS WHAT THE LAW STATES New Zealand Building Code G Ventilation summarised ??Buildings shall have a means of collecting or otherwise removing cooking fumes and odours steam from laundering utensil washing bathing and showering odours from sanitary and waste storage spaces poisonous or ammable fumes and gases ? ? Natural Ventilation for the above is acceptable as long as opening windows in each room have an area of or more of the oor area of the room ? For internal rooms without natural ventilation mechanical ventilation extraction fans must be installed to extract the air at given rates Residential requirements are listed below ? Where fans are used to remove moisture and other contaminants from kitchens bathrooms and laundries in housing the exhaust air must be ducted to the outside at the ow rates mentioned below ? Extraction of wet rooms e g bathroom toilet laundry must be kept separate from kitchen extraction MOISTURE AND CONDENSATION Factors that a ?ect condensation and moisture include ? Bathroom size and materials used on the oor walls and ceiling ? Size and type of shower and showerhead ? Cold surfaces such glass mirrors tiles wet-wall linings cold uninsulated ceiling linings etc ? Cold air sources i e an open window ? Water pressure INDUSTRY RECOMMENDATIONS ? The mentioned ow rates below are minimum allowable In general these would not be enough to overcome excessive moisture and condensation problems encountered in modern homes ? The ventilation industry has a ??Recommended AirChanges per Hour ? approach solution i e An air ow rate su ?cient to remove replace the total volume of air in a given room a speci ?ed number of times each hour ? Obviously fans will not necessarily be left running for an hour - a fact which is taken into consideration in the formula Bathrooms l s Laundries l s Toilets l s minimum ow rates are of a fan installed with ducting and grilles measured at the inlet grille with an anemometer TIPS FOR REDUCING CONDENSATION AND AIDING EXTRACTION The following tips will ensure that the system is able to run as e ?ciently as possible ? Keep windows closed speci ?cally in winter cold outside air mixing with warm inside air will cause an increase in condensation ? Ensuring su ?cient makeup air in order for the fan to function e ?ciently fresh air is needed to replace the extracted air A mm gap under the door or a door grille will provide su ?cient makeup air during a shower ? Heating using a bathroom heater to warm the room before a shower will assist in reducing condensation ? Post shower after a shower keep the fan running for at least minutes and also keep the bathroom door open to aid extraction CEXTRACTION SELECTION CHOOSING A FAN ? AIR CHANGES PER HOUR ACH The number of times the total room volume of air is changed each