Grit and dust from furnacesN.I.
7 .F1—(1) The Department may by regulations prescribe limits on the rates of emission of grit and dust from the chimneys of furnaces to which this Article applies.
(2) If on any day grit or dust is emitted from a chimney serving a furnace to which this Article applies at a rate exceeding the relevant limit prescribed under paragraph (1), the occupier of any building in which the furnace is situated shall be guilty of an offence.
(3) In proceedings for an offence under paragraph (2) it shall be a defence to prove that the best practicable means had been used for minimising the alleged emission.
(4) If, in the case of a building containing a furnace to which this Article applies and which is served by a chimney to which there is no limit applicable under paragraph (1), the occupier fails to use any practicable means there may be for minimising the emission of grit or dust from the chimney, he shall be guilty of an offence.
(5) This Article applies to any furnace in which solid, liquid or gaseous matter is burnt, not being a furnace designed solely or mainly for domestic purposes and used for heating a boiler with maximum heating capacity of less than[F2 16.12 kilowatts] per hour.
F1prosp. rep. by 1997 NI 18
F2SR 1994/192