# The Road Vehicles (Construction and Use) Regulations 1986, Paragraph 14

Extent: E+W+S

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.

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Source: https://www.legislation.gov.uk/uksi/1986/1078/schedule/5/paragraph/14 (the official version)
Page: https://openlegislation.uk/road-vehicles-construction-and-use-regulations-1986/schedule-5/paragraph-14
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.