The Smoke Control Areas (Exempted Fireplaces) (Wales) Order 2009

1.  The fireplace must be installed, maintained and operated in accordance with the manufacturer’s installation instructions IAV SE/EX 0737-4 511866 and Lighting instructions BAV SE/EX 0717-1 511865.

A permanent stop must be in place on the air inlet to prevent closure beyond a minimum air open position.