S.L. 549.122 Art. 6Aggregation. 7 Stack height. S.L. 549.59.

(1) A combination formed by two or more new medium combustion plants shall be considered to be a single medium combustion plant for the purposes of these regulations and their rated thermal input shall be added together for the purpose of calculating the total rated thermal input of the plant, where:

(a) the waste gases of such medium combustion plants are discharged through a common stack; or

(b) taking into account technical and economic factors, the waste gases of such medium combustion plants could, in the judgement of the competent authority, be discharged through a common stack.

(2) The minimum chimney heights for the installations within the scope of regulation 4 shall not be less than those calculated according to the guidelines issued by any other regulating entities:

Provided that the chimney height shall in no case be less than 3 meters above roof level.

(3) The provisions of sub-regulation (2) may be reviewed if it results to the Authority through studies by the operator upon request of the Authority, that chimney height requires to be increased so as to enable in-stack monitoring and provided further that this review does not lead to any exceedances of the limit values or target values in Schedule 7 of the Ambient Air Quality Regulations.