WT Knowles range of Lintels are suitable for use with round flue liners with an internal diameter of 225mm or 300mm
When determining flue size and size of the fireplace recess opening, the following should be considered:
- Appliance Type
- Fuel type
- Planning
- Building Regulations ( typically - Approved Document J)
Selection of a system will show which products and combinations of products are available for that size of flue liner and fireplace opening
