Many propertys will have multiple chimney flue terminals on the Chimney stack,

If your chimney or flue is not covered with the correct flue cap, Water and Pests can enter your chimney flues and can cause fast deterioration of the Flue and Chimney Stacks intergrity . This can mean you may need to pay for a replacement of the flue Or even a Chimney stack Rebuild.

It is recommended that all chimney terminals be capped if they are Working Or Disused.