The Smoke Control Areas (Exempted Fireplaces) (Wales) Order 2001
Section 20 of the Clean Air Act 1993 generally prohibits the emission of smoke in smoke control areas. The National Assembly for Wales may by order made under section 21 of the Act exempt specified classes of fireplace from the provisions of section 20, if it is satisfied that they can be used for burning fuels without producing any smoke or a substantial quantity of smoke.