The Road Vehicles (Construction and Use) Regulations 1986

Gas-fired appliances

12.  Every part of a gas-fired appliance shall be—

(a) so designed and constructed that leakage of gas is unlikely to occur, and

(b) constructed of materials which are compatible both with each other and with the gas used.

13.  Every gas-fired appliance shall be—

(a) so located as to be easily inspected and maintained,

(b) so located and either insulated or shielded that its use shall not cause or be likely to cause danger due to the presence of any flammable material,

(c) so constructed and located as not to impose undue stress on any pipe or fitting, and

(d) so fastened or located as not to work loose or move in relation to the vehicle.

14.  With the exception of catalytic heating appliances, every appliance of the kind described in regulation 96(3)(b) or (c) which is fitted to a motor vehicle shall be fitted with a flue which shall be—

(a) connected to an outlet which is on the outside of the vehicle,

(b) constructed and located so as to prevent any expelled matter from entering the vehicle, and

(c) located so that it will not cause any adverse effect to, or suffer any adverse effect from, the exhaust outlet of any engine or any other source of heat.