Subject to the provisions of this section, no furnace shall be installed in a building or in any boiler or industrial plant attached to a building or for the time being fixed to or installed on any land unless it is so far as practicable capable of being operated continuously without emitting smoke when burning fuel of a type for which the furnace was designed, and any person who installs a furnace in contravention of this subsection or on whose instructions a furnace is so installed shall be guilty of an offence:

Any furnace installed in accordance with plans and specifications submitted to, and approved for the purposes of this section by, the local authority shall be deemed to comply with the provisions of subsection (1) of this section.

A furnace to which subsection (1) of this section applies shall not be installed in a building or in any such boiler or plant as is mentioned in the said subsection (1) unless notice of the proposal to install it has been given to the local authority, and any person who installs a furnace in contravention of this subsection or on whose instructions a furnace is so installed shall be guilty of an offence.

This section shall not apply to furnaces designed solely or mainly for use for domestic purposes, not being furnaces of boilers with a maximum heating capacity of F216.12 kilowatts or more.

This section shall apply in relation to the attachment to a building of a boiler or industrial plant which already contains a furnace or the fixing to or installation on any land of any such boiler or plant as it applies in relation to the installation of a furnace in any boiler or industrial plant attached to a building or for the time being fixed to or installed on any land.