Under the Clean Air Act 1968, a person having possession of a boiler or industrial plant attached to a building or for the time being fixed to or installed on any land (other than an exempted boiler or plant) is required to obtain the approval of the local authority to the height of the chimney if he proposes to construct a new chimney or to enlarge the furnace.
However, in certain situations, Chimneys can be exempted from the need for approval. These regulations define those situations, which includes during temporary or local provision of heat or power during replacement or maintenance, building operations, engineering construction, investigation or research, and agricultural operations.
It should be noted that this Regulation has been revoked by the 'The Clean Air (Miscellaneous Provisions) (England) Regulations 2014'. The links for that legislation can be found in the group of links in this article.
