External Twin Wall Installation

Basic External Installation


The twin-wall system is designed to be used where an existing chimney stack is not present or when the appliance is required to be used against an external wall.

Jeremias twin-wall is an easy to install “push-fit” system and a locking band is provided with each component to go around the joint (except those specified).

There are a number of important points to be aware of when installing a twin-wall system:

  • A minimum of a 60mm clearance must be
  • maintained from anything combustible at T450. See Product Designation.
  • There should be as few offsets as possible and the distance between the bends should not
    exceed 20% of the vertical height of the chimney.
  • The chimney should have an adequate clearance from the roof.
  • Please see Document J Building Regs for more details.
  • The diameter should never be reduced to less than the appliance manufacturers’ instructions.
  • Provisions for sweeping must be provided.

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