Clearance requirements for the installation of gas cookers, rangehoods and splashbacks
January 28, 2019
HIA receives many calls regarding the clearance requirements for rangehoods and splashback to gas cookers. The information below is provided to assist industry when installing a domestic gas cooking appliance. AS/NZS 5601.1: 2013 Gas installations Part 1: General installations, explains that the required clearance distance between a gas cooking appliance and a rangehood or exhaust fan must be in accordance with the manufacturer's relevant instruction.
Where clearances are not specified by the manufacturer, then clearance distances must be as described in AS/NZS 5601.1: 2013.
Scenario 1 – Overhead clearance rates specified on installation instructions
Where the manufacturer of the gas-cooking appliance and the rangehood both specify a minimum overhead clearance rate, then the practitioner must use the greater of the two clearance rates, as shown in the example below:
||Minimum clearance rate specified by manufacturer
||Clearance rate to be used by practitioner
|Gas Cooking Appliance
Scenario 2 – Overhead clearance rates not specified on installation instructions
Where the manufacturers of the gas-cooking appliance and the rangehood / exhaust fan do not specify a minimum clearance rate, then the practitioner must provide a clearance rate of no less than 600mm for a rangehood and no less than 750mm for an exhaust fan, in accordance with AS/NZS 5601.1 Clause 22.214.171.124 (a). All measurements are to be taken from the highest part of the highest burner of the gas-cooking appliance.
For the installation of a gas-cooking appliance where the edge of the gas burner is less than 200mm from a combustible surface, the Standard now only requires either standard cement sheet or gypsum plasterboard substrates to protect combustible surfaces, with some conditions. This removes the need to use a specific fireboard material.
The requirements for splashbacks less than 200mm from the edge of any gas burner can now be satisfied by the following:
- Ceramic tiles minimum 5mm thick over either 10mm minimum thick gypsum based plasterboard or 6mm minimum thick fibre cement sheet
- Toughened safety glass (glass splashbacks) minimum 5mm thick over either 10mm minimum thick gypsum based plasterboard or 6mm minimum thick fibre cement sheet
- Sheet metal minimum 0.4mm thick over either 12mm minimum thick cement sheet or a combination of 6mm minimum thick fibre cement sheet and 10mm minimum thick gypsum based plasterboard
- This protection must extend the full width or depth of the cooktop or cooking surface, which does not include control knobs, to a minimum height of 150mm above the periphery of the nearest burner.
- Safety glass for glass splashbacks should comply with the relevant Australian Standard AS/NZS 2208 ‘safety glazing materials in buildings’ and the glass marked ‘safety glass’ to ensure that it’s fit for purpose
Note: The appliance manufacturers installation specifications override these minimum requirements if the manufacturer requires greater clearance or greater protection of combustible surfaces
For further information, please call 1300 650 620 to speak with Building Services .