Safety Alert
Gas appliance flue terminal
requirements for recreational vehicles
(RV) with annexes
The purpose of this Safety Alert is to highlight the risk of CO poisoning if flue terminals for gas appliances
are incorrectly installed in recreational vehicles with annexes.
Background
AS/NZS5601.2:2013 (the Standard) specifies the minimum safety requirements for fluing gas appliances
installed within recreational vehicles. These requirements must be considered by the recreational vehicle
and aftermarket annex industries to ensure compliance with the Standard is not compromised.
Examples of flued gas appliances:



Refrigerators
Hot water heaters
Room heaters
It should be noted the ventilation openings and fluing requirements of the Standard are not new.
These minimum safety requirements have been within the Standard (in various forms), since 1992.
Examples of gas appliance flue terminals
Caption: Refrigerator flue terminal on an RV
Caption: Water heater flue terminal on an RV
Gas appliance flue terminals must terminate and discharge their products of combustion outdoors. The reason
a flue terminal cannot be terminated indoors (inside an annexe) is to prevent excessive build-up from products
of combustion, condensation, or other toxic conditions, such as carbon monoxide (CO) build-up, from
eventuating.
Gas appliances are a potential source of CO poisoning. RVs and their annexes pose an increased risk of
CO poisoning due to the small area within which gas appliances operate. As a result, faulty or incorrectly flued
appliances can rapidly increase the CO concentration in RVs and associated cover areas such as annexes to
potentially dangerous levels. The risk of CO poisoning is well demonstrated by inappropriate use of gas
appliances in enclosed vehicles which led to the deaths of two men in separate incidents in Queensland in
2007 and 2009.
Contributing factors
Consideration of appliance ventilation must be given when fitting an annex to any RV (motorhome,
campervan, camper trailer, or caravan).
Are there any gas appliance flue terminals on the side of the RV where the annex is going to be fitted?
The Standard requires the flue terminal to be located in an outdoor position that allows the products of
combustion to readily disperse and not cause a nuisance.
A typical three sided annex shown below does not meet this requirement.
Caption: Flue terminals under a covered area
If the area is covered, such as that under an awning or within an annex:
1. the area must be open on two sides and the flue terminal located to ensure a free flow of air across
it is achieved
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Gas appliance flue terminal requirements for RVs with annexes (version 1.0 – 1 September 2014)
2. in the case of a fan assisted flue the area can be open on one side, if the terminal is within 500mm
of the opening and the direction of discharge is towards the open side.
If in doubt consult a holder of a gas work licence or this department before proceeding.
Caption: Example of an annex/awning open on two sides
Ventilation
Ventilation for gas appliances and the use of ‘outdoor’ gas appliances is a separate issue to the location
of the flue under a covered area. These requirements can be found elsewhere within the standard.
Action required
1. Caravan designer/manufacturers should:
 modify caravan design to ensure gas appliance flue terminals are located to allow for the addition of
aftermarket annexes without compromising existing gas system compliance. The majority of new RVs
are manufactured with all flued gas appliances on the off (or driver) side of the vehicle which eliminates
this issue as annexes are normally located on the passenger side where the door is located
 educate caravan purchasers about the flue terminal requirement and advise on appropriate
annex/awning design.
2. Annex/awning manufacturers/suppliers should:
 ensure the design and placement of any proposed enclosed annex does not compromise the
compliance of an existing gas system
 not provide annexes that are known to cause a non-complaint system
 education caravan users about the requirement.
3. Owners of RVs need to:
 be aware of the requirement when purchasing or using RVs and annexes to ensure safety and
compliance of the gas system is not compromised understand that alterations to flue terminals or their
locations cannot be undertaken by unlicensed persons and would require further approvals
 contact a licensed gas installer or this department if they need any further advice.
4. Licensed gas installers must:
 ensure when certifying the gas system of an RV that there is no existing stored annex or awning, that
when installed would compromise the compliance of the gas system
 clarify on any certificate issued the circumstances of the approval. E.g. RV with no annexe or with
compliant annexe.
Note: The Northern Territory Dangerous Goods Regulation 177 specifies the installation shall conform to the
requirements specified in AS5601 “Gas Installations – General installations” and therefore makes it an offence
for a person to cause an existing gas system to not comply with the Standard.
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Gas appliance flue terminal requirements for RVs with annexes (version 1.0 – 1 September 2014)
Further information
Legislation

Northern Territory Dangerous Goods Regulations
Contact details
Call us on: 1800 019 115
Email us at ntworksafe@nt.gov.au
For more information on work health and safety, go to NT WorkSafe’s website at www.worksafe.nt.gov.au
Disclaimer
The information in this Safety Alert contains safety information published by the Queensland Department of Natural Resources and Mines. NT WorkSafe
does not warrant the information in this Safety Alert is complete or up to date and does not accept any liability to any person for the information in this
report or as to its use.
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Gas appliance flue terminal requirements for RVs with annexes (version 1.0 – 1 September 2014)