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Flue & Chimney Connection

Fabbri Flue Diagram
A  Insulated Chimney
 Storm Collar
C  Roof flashing
D  Roof support to retain chimney
E  Twin wall to single wall adaptor
F  Single wall flue pipe. Twin wall is also suitable
G  Wall support. Retains internal flue 
H  Internal bends
I  Flue starter kit
J  Flue to adaptor
K  Debris trap for falling soot (with water drain point in the end cap)
L  Flue support stand


Single wall or Twin wall chimney 

Single wall chimney may be used inside a building however we would recommend twin-wall insulated chimney. 

Access for cleaning

Good access for cleaning must be included in the chimney system.

Connection to the rear of the appliance 

  • The F28 is only available as a natural draught chimney model. This is commonly fitted with a 90deg bend at the rear to allow for a vertical rise of the chimney.
  • The F55 and F85 models can be supplied with natural draught chimney versions or our recommended flue fan versions.
  •  Whichever version is chosen we would recommend the first connection is a T pipe of 90deg or better still a 135deg T pipe. 

Chimney support

The weight of the chimney should be supported by a stand and not the rear of the appliance.

Bends in a chimney

These should be kept to a minmium. Where a bend is needed it should be of no more than 45deg.

Chimney cowl

We do not recommend a chimney cowl as this can slow the volume of flue gasses. We recommed a cap of the connecting T pipe to include a drain point. This drain will allow any excess rain which enters chimney to exit the chimney system.



Routing Chimney through roof


There are several different methods to pass through a roof.

  • The chimney must be supported as it passes through the roof. Commonly roof support is used.
  • Any wood or flammable material MUST be at least 2" 50mm away from the outside of the twin wall insulated chimney pipe. (refer to chimney manufacturer).
  • Prevent water ingress. A roof flashing should be used.
  • In heavy weather conditions, it is possible to rainwater can leak between chimney and flashing seal. Use a storm collar attached above the flashing.