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When installing a flexible flue liner in an existing chimney there are a number of options available at the top of the chimney stack for securing the flexible flue liner and reducing water and bird ingress into the chimney.

The main factors that help determine the appropriate liner fixing method are:

  • The chimney stack has a chimney pot
  • The installer recommends removal of a chimney pot during installation
  • The chimney stack does not have a chimney pot

The most common flexible flue liner installation methods to cater for both chimney and non chimney pot are shown below.

Flue liner installations with chimney pot

Pot hanging clamp and cowl

Pot is not removed

Fitting flexible chimney flue liner - Pot hanging clamp and cowl

The pot hanging clamp and cowl can make installations easier and is certainly a good option when backfilling the chimney with granular insulation.
Available for 5 and 6 inch flue liner.

Pot hanging cowl

Pot is not removed

Fitting flexible chimney flue liner - Pot hanging cowl


Available in all flue liner sizes.

Top plate and clamp

Pot has to be removed

Fitting flexible chimney flue liner - Top plate and clamp

Backfilling with insulation is completed before installing the top plate and clamp.
Available in all flue liner sizes.

Flue liner installations without a chimney pot

Top plate and clamp with rain cap

Fitting flexible chimney - No chimney pot

Backfilling with insulation is completed before installing the top plate and clamp.
Available in all flue liner sizes.

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